Formulate the research question, identify key concepts and words, prepare your search logic. Always try more than one search engine. They are all different and will return different results. Also try to be less specific or try another search engine. Try to think of words that are unique to what you are looking for.
Some words are of little value because they identify lots of documents.
Boolean logic Search technique that uses certain logical operators to combine search terms. Variations on these operators, sometimes called proximity operators, may be supported by some search engines. The process by which a robot downloads and indexes Web documents. For most search engines, you can indicate a phrase search by placing your keywords in quotes. The request a user types into the search interface and submits to the search engine.