First, watch the brief video below to learn how to identify and use keywords.
Then, read more about identifying the main concepts in a research question here.
Finally, try this exercise on identifying the main concepts in a research question.
Brock University Library. (2012, November 16). How to improve your search terms [Video]. YouTube.
Search for the nouns: ignore minor words, connecting words, and verbs
Ignore generic words like effect, impact, cause, increase, decrease, etc.