How we earn money from search engine?

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Hi friends, Any one help me to implement search engine to my site and earn money?i.e., Steps to inserting search engine box in my site and earn money while searching queries by others. One of my online friend had inserted search box in his site, if i search any thing the result shows the customized result of both Yahoo and Google search engines. Can any one help me that how to we earn from search engines. I am waiting for your responses.