This video from the University of North Carolina Greensboro demonstrates how to select key words for your topic. "From Question to Keyword," by UNCG Libraries is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
One of the best ways to improve your research results is to build a list of keywords. Sometimes it can be difficult to tap into the right words that will lead you to the information you need. Try this strategy...
You might also want to try this keyword generator created by University of Texas at Austin:http://lib.utexas.edu/keywords/