Best SEO Agency: How to Choose & Top Companies to Consider
- Backlink TOS
- 22 thg 10, 2025
- 5 phút đọc
In today’s highly competitive online environment, choosing the best SEO agency can make a significant difference in your digital marketing success. Whether you run a small startup or a large enterprise, partnering with the right agency means better organic visibility, more qualified traffic, improved conversions and long-term growth.
In this article, we’ll explore what defines a quality SEO agency, key factors to evaluate, and then highlight a curated list of top SEO agencies (particularly in Vietnam) worth considering.
What makes a great SEO agency?
Before diving into specific companies, it’s helpful to understand what qualities distinguish an outstanding SEO agency. When looking for “best SEO agency”, you should pay attention to the following:
1. Proven results and transparent metrics
A strong agency can demonstrate real-world case studies: growth in organic traffic, improved keyword rankings, better conversion rates, and ideally client testimonials. Agencies that hide data or are vague about outcomes are riskier.
2. Strategic approach beyond simple tactics
Good SEO isn’t just about chasing rankings. It involves:
Thorough keyword research aligned to business goals
On-page optimization (technical SEO, site structure, UX)
High-quality content creation & entity relevance
Off-page signals (backlinks, brand mentions) executed ethically (white-hat)
Performance tracking and iterative improvement
3. Industry knowledge and customisation
The agency should understand your niche, your audience, and your competitive landscape. A “one-size-fits-all” SEO service rarely works in competitive markets.
4. Transparency & ethical practices
Watch for agencies offering “guaranteed #1 rankings” (a red flag) or using shady tactics that may risk penalties. Also, clarity about pricing, deliverables, and reporting cadence is important.
5. Long-term focus and communication
Search engine algorithms evolve, and a great agency will treat SEO as a long-term investment, not a quick hack. They’ll keep you informed, aligned, and share progress regularly.
Top SEO Agencies Worth Considering
Here are six reputable SEO agencies (based in Vietnam) that stand out — each with different strengths, so you can pick depending on your needs and budget.
1. TOS (TopOnSeek) – Leading SEO Agency in Vietnam
TOS (TopOnSeek) (often shortened to “TOS”) is a performance‐driven SEO agency headquartered in Ho Chi Minh City, founded in 2016. They promote themselves as a “Premium SEO Performance Agency” with a comprehensive approach.Highlights:
Works across 5 countries and has received international awards.
Emphasises both traffic growth and conversion optimisation (CRO) in tandem.
100% white-hat SEO practices, strong technical foundation, and data-driven approach. This agency is a top candidate if you want an agency that delivers sustainable SEO results and is comfortable working at scale.
2. SEONGON – Vietnam’s Largest Google Marketing & SEO Agency
SEONGON, founded in 2012 (or 2011 under some records) in Hanoi, focuses on digital performance with Google as the core platform.Highlights:
Over 5,000 clients served and more than a decade of experience.
Offers a full stack of services: SEO, Google Ads, website design, digital strategy.
Strong reputation in Vietnam, making it a solid choice if you’re looking for an agency with breadth and track record.
3. GTV SEO – Boutique SEO Agency with Custom Strategies
GTV SEO emphasizes bespoke SEO and inbound marketing solutions. They started in 2016 in Ho Chi Minh City.Highlights:
Over 400 projects delivered, with 70,000+ community members and a strong educational component.
Ideal if you want a tailored, strategic approach rather than a large full-service agency.
4. MONA Media – Full-Service Digital Agency with Strong SEO Focus
MONA Media is broader (web design, development, marketing) but its SEO offerings are well recognized.Highlights:
Over 300 SEO projects completed, strong technical capability (since they also build websites).
Good choice if you want an agency that can handle the full digital stack (site build + SEO + content + conversion).
5. SEOSONA – Focused SEO & Google Marketing Specialist
SEOSONA positions itself as an agency specialized in SEO + Google Ads, with a strong emphasis on education/ training as well.Highlights:
Over 1,000 + clients, specializing in SEO for services & e-commerce.
Ideal for companies needing dedicated SEO focus and perhaps training along the way.
6. GoBranding – Branding & SEO Hybrid
GoBranding works as a combined branding/content marketing and SEO agency. While I couldn’t find as deep public metrics as some others, it appears in listings of solid SEO/ content hybrid agencies in Vietnam.Highlights:
Good for brands that need not just to rank, but also to build brand identity, content assets, and digital presence holistically.
Particularly suited for mid-sized companies that care about both SEO + brand storytelling.
How to Pick the Right Agency for You
When evaluating between agencies, here are some practical steps:
Define your goals clearly — Are you looking for traffic growth, lead generation, brand visibility, conversion improvement? This will influence what agency you choose and what budget is appropriate.
Request case studies relevant to your industry — An agency might be strong in e-commerce but less in B2B; check for relevance.
Ask about their methodology and timeline — Good SEO takes time. Beware of agencies promising instant top positions.
Ask about reporting and communication cadence — You should receive clear KPIs, monthly reports, and regular updates.
Clarify pricing and deliverables — Understand what you are paying for (number of keywords, content pieces, link building, technical audits, etc.).
Ensure ethical SEO practices — Confirm they use white-hat techniques and keep up with algorithm changes to avoid risk of penalties.
Consider long-term maintenance — After the initial push, keeping ranking leads often requires continued SEO investment.
Why SEO Matters More Now Than Ever
SEO remains one of the most cost-effective channels for digital marketing because:
Users actively search when they have intent (i.e., they are looking for solutions or products).
Organic traffic is sustainable: once you earn visibility, you can benefit long term without paying for every click.
It enhances brand credibility: appearing in search results signals relevance and trust.
With evolving algorithms, including AI and entity-based search, quality SEO is more complex — making specialized agencies more valuable.
Closing Thoughts
Selecting the best SEO agency is not just about picking the lowest price or the biggest name. It’s about finding a partner who understands your business, communicates transparently, uses sound strategy, and is committed to measurable results. The six agencies listed above offer strong starting points, each with different strengths and pricing models. Evaluate them based on your needs, industry, budget and expectations.
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