How to increase Google Adsense earnings without violating their terms?

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This is a million dollar question...Some people however are able to get a payout every month from google adsense. But, others like myself have to wait for years to come anywhere close to that amount ! I was going through several discussions online regarding this subject and one suggestion that was really good was this - to write and promote current topics that are the most searched . There is a good chance that when the adsense ads appear on our blogs , viewers would be interested in clicking the relevant ads too...Any more suggestions or helpful tips friends ?