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The most common reason ads show for odd, unrelated searches is your match types.
If you add a keyword without any punctuation (e.g., office chair), you are using broad match. This lets Google show your ad for searches it considers related, even loosely.
Example of the trap:
Your keyword: office chair (broad match)
Where your ad may appear:
| "Office Space movie quotes" | Related by the word "office" |
| "Wheelchair repair" | Related by the word "chair" |
| "Ergonomic kneeling stool" | Related by concept |
The fix: Check your keyword list. If there are no "quotes" (phrase match) or [brackets] (exact match) around your words, your net may be too wide. Unless broad match is working well for you with Smart Bidding and regular search term reviews, switch those keywords to phrase or exact match.
Google has a feature called auto-applied recommendations. If it is enabled, Google can automatically add new keywords to your account when it thinks they will bring you more traffic.
These suggestions often focus on volume, not relevance.
How to check:
Go to Recommendations in the left menu.
Open Auto-apply (top right) and review the History tab.
Check whether "Add new keywords" is turned on.
Turn it off if you want full control. You know your business better than the algorithm does.
Years ago, [red shoes] meant only "red shoes." Today, Google uses close variants, so even exact match keywords can match:
Sometimes Google’s idea of "same meaning" is off (e.g., matching "landscape design" with "lawn mowing service," two very different jobs).
The solution: You can’t turn off close variants. Your best defense is a well-maintained negative keyword list that tells Google what not to target.
If you run a Dynamic Search Ads (DSA) campaign, you don’t use keywords at all. Google reads your website content and automatically generates ads based on what it finds.
The risk: If your website has a blog post about "The History of Coffee," Google might show your ads to people searching "coffee history," even though you sell coffee machines.
The fix:
Check whether you have any dynamic ad groups running.
If so, open your Dynamic ad targets.
Target specific "URL contains" rules (e.g., only pages with /product/), not your entire website.
Final check: Irrelevant searches waste budget, but bot traffic can waste it even faster. Even with perfect targeting, bots can still click your ads. ClickSambo blocks invalid traffic sources that no keyword setting can fix.
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