I found an article that are from pubrevenue.com. There is no author name but the blog article provide a useful tips on how to increase the earning from your Google adsense. By reading the article, you will benefit from the article that will help you to do better in your blogging for earning.
There is a few things needed to take note:-
-Lots of Theme-based content.
-Put primary keyword in title and h1 tags.
-Name the file using the keyword.
-Use section targeting.
The interesting part that control the Google relevancy ads is by inserting the HTML code in your content. like...
okey, the rest is up to you to read up that article and the link is below.
Link to article:- How to Control the Ads and Increase Relevancy.
have a good day!