As you review books, journals and other literature, make a list of the keywords and search terms that you have used. It is often useful to list the terms that aren't useful / relevant, as well as the ones that are.
You may wish to create a mind map of all of the terms that apply to your topic before conducting your literature search. This mind map can then be used to guide your literature search, and ensure that you discuss pertinent concepts in the review itself.
This mind map and its sections can also be the subsections that you use for storing the results of your research.
Hint: Use the Groups function in EndNote to create sub-groups of your EndNote Library that match your Literature Review sections.
Many mind mapping tools are available on the web.