it isn't a search per.se. he is asking about. It is a data analysis, expert system like. He wants a computer, not a search engine. Network/Internet is a computer. Or Google search engine farm in this case would be a pretty good replacement/approximation for the Internet. In this case if Google let some user-specified business logic (ie. something more complex than "search_term1 AND search_term2") to run over its digested representation of the Internet.

Cash crops profits [ordered desc] = {P(C1), P(C2), P(C3)}.

Legal cash crops = {C2, C3}.

Successfully plantable by inexperienced farmer = {C1}.

... without C1 the expert system refuses to continue further :)