The Ads Diagnostic Tool can provide insight into the reasons why your ad might not be showing up when you look for it.
Use the Ads Diagnostic Tool (AdWords sign in required) now to find out if your ads are showing for particular searches.
To see which keywords are triggering your ads, you can also go to the Campaigns tab within your account. Then, choose the Keywords tab, and click the speech bubble icon to see more information about your keyword.
