Understanding what you should type in the search box of any search engine/database is always harder than it sounds. It seems like it should be simple - like pulling on your socks in the morning - but in truth taking an abstract-length concept and distilling it down to just 3 or 4 keywords is actually very difficult!
When brainstorming for keywords, consider Googling synonyms, related terms, and subtopics related to your research question. You will also find more potential keywords as you search through the literature.
The resources below were created to give you some tips and tricks and pointers about how to refine your searching such that you get exactly the sort of results you are looking for without having to wade through lots of irrelevant search results that have no relevance to you.
Booleans: AND, OR, NOT
Quotation marks
Asterisks
Limiters