But when? Videos like http://www.youtube.com/watch?v=eHtC-L7sMAI 2,520 views and 5 likes and now running google ads i can see but why my earning is still $0?
Did you ever find the section of your Adsense account where you authorize YouTube to use your Adsense code?
If your videos get that much traffic there should be no reason for your Adsense account to show that you haven't made any money at all from your videos. You need to find that section of your Adsense account and see if YouTube has been authorized to run your Adsense code, I'm almost sure that is what's going on.