Need help still learning. Why is google not paying for all my clicks?

I went to a 2nd rate/3rd rate search engine and bought traffic from Marchex formally Enhance. I was driving traffic to my adsense sites. Google paid for the first 35 clicks that were recieved from this traffic to my site but the last 45 click google has not paid anything. Any suggestions. What happen? How do you overcome this….?:(

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