Pull out the most important aspects of your research question
Use different keywords / synonyms / alternate terms
Brainstorm a list or create a word web
Use a thesaurus to help you think of alternate words
Example:
Have social media sites led to an increase in bullying among young adults?
Social Media: social network, social platform
Bullying: tormenting, hectoring, harassing
Young Adults: adolescent, juvenile, teenager, emerging adult