Google Ads Smart Bidding: What Actually Works After 5+ Years Running Campaigns

Minh has run Google Ads across many phases — from the days of manual bidding and hourly bid adjustments, to Smart Bidding becoming the default. And the one thing that became clear after years of doing this: Smart Bidding isn't magic — it's only as good as the data you feed it.

The Core Lesson: Conversion Tracking Is the Foundation

While working at Kyna English, Minh scaled Google Ads revenue by 180–500% — but not by picking the right bidding strategy from day one. The real breakthrough came from rebuilding conversion tracking from scratch: right events, right values, right conversion windows.

Smart Bidding runs on signals. If your conversion data is incomplete, delayed, or tracking the wrong events (e.g., page views instead of form submissions), the algorithm optimizes toward the wrong goal — no matter which strategy you pick.

3 Things Minh Does Before Enabling Smart Bidding

• Audit every conversion action: Make sure each action genuinely reflects a business goal — no over-tracking, no under-tracking.
• Ensure data is consistent and frequent: The algorithm needs steady, real-time signals. Low-volume campaigns cause Smart Bidding to fluctuate and underperform.
• Warm up before tightening targets: At ELSA Speak, Minh started with Maximize Conversions to build data, then shifted to Target CPA — resulting in a 145% increase in conversion ad revenue.

As Google Ads Gets More Automated: Clean Tracking Matters Even More

Google is integrating AI deeper into ads — automatically writing copy, selecting audiences, and allocating budget. The more that gets automated, the more important your conversion tracking becomes. The system is learning from more signals than ever — one bad data point can throw off the entire optimization direction.

At 51Talk, Minh reduced CPA by 15% — not by constantly switching bidding strategies, but by cleaning up conversion data and giving the algorithm time to learn properly. Smart Bidding doesn't need you to intervene constantly. It needs you to give it the right things to learn from.

If your Smart Bidding campaigns are unstable, check conversion tracking first. In Minh's experience, that's the root cause 8 out of 10 times.