When searching the literature, it is important to come up with a keyword search, or search string. Columbia University defines a keyword search as the following:
A Keyword search looks for words anywhere in the record. Keyword searches are a good substitute for a subject search when you do not know the standard subject heading. Keyword may also be used as a substitute for a title or author search when you have incomplete title or author information. You may also use the Guided Keyword search option to combine search elements, group terms, or select indexes or fields to be searched.
http://www.columbia.edu/cu/lweb/help/clio/keyword.html
Remember to keep track of what keyword searches you have conducted so you can save time and determine how to improve your search and continue with the searching process.
