Among those who want to make high revenue from Google AdSense, most of the AdSense publishers are looking for top level keywords: which keywords receive top commission in clicks. This is true because "higher an advertiser pays for a keyword, the higher the publisher receive commission in per click", so the publishers try to find the higher paying keywords in their content of website links. The most expensive AdWords, which will typically bring the highest paying AdSense clicks, are those related to industries with high profit margins.
But, how can the publishers find those keywords for their site (s)? That is a great question for the publisher because finding good and high PPC keywords and managing the keywords in content or article is really a challenging task. Well, the answer depends on who you are and what you have prepared to reach to those keywords. But the general good news is that you can, indeed, find such keywords if you need them.
Certainly, there are different ways to find the high paying keywords: paying methods and free methods. If you want to find high paying keywords free of cost, you can try searching Google. But there are many companies which are selling their services to help to find high paying keywords.
There is another method, if such a solution does not work for you; You can ever choose a method of personal investigation. That means you can try out keywords by yourself and see which one works better or worse for you. For that reason, you can try http://www.adwords.google.com/select/KeywordToolExternal or http://freekeywords.wordtracker.com/ for keyword suggestion as "keyword suggestion tools". But you can use different ways to find good paying keywords by exploring yourself.
So, there are different methods to find high paying keywords to increase Google AdSense revenue. But, I have to say that, only having high paying keywords do not work to increase AdSense revenue; Those are the trips to increase the revenue. So try your best to increase your AdSense revenue.