Information mining on the Internet.
As with most software, developers tend to create interfaces which seem logical and user-friendly. The only problem is that 'logical' to one person is confusing to another. The best approach is try out several search engines and spend enough time trying sample searches that you get a feel for the degree to which it satisfies your needs. All of these sites have adequate help areas and should be your first stop. Hopefully, these tools will help you to spend less time aimlessly surfing and more time realizing the potential of the Internet.
Turecek
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D003195:Computer Communication Networks; D006801:Humans; D008511:Medicine