What is your research about?
Which words would best capture your topic?
Here is an example about how you may want to plan your search.
Don't know where to start?
Knowledge is of two kinds: we know a subject ourselves, or we know where we can find information upon it. -- Samuel Johnson (1709 - 1784)
For an introduction to concepts and ideas for research topics, electronic reference sources or subject Encyclopedias can be useful.