When you run a literature search, if you are extremely lucky, you'll quickly discover the relevant Subject Headings, and when you combine sets, you'll magically come up with 30 perfect articles!
But in real life, that rarely happens. More often you'll run a search and either come up with hundreds or even thousands of results, or you'll come up with zero results. In either case, you'll need to be able to draw upon your knowledge of the search techniques covered in this research guide to finesse your search so that it will bring up the literature you need to answer your research question.
TOO MANY RESULTS!
When your first attempt bring up too many results, try one of these strategies to simultaneously reduce the numbers of hits, and focus the results:
TOO FEW RESULTS!!
Too few results can be a problem indeed! Here are some tactics to try: