Using the suggested term improves results retrieved:
It is not unusual to retrieve too many articles, too few articles, or not exactly what you need. When that happens, you will need to refine your search. Just remember that the more limits you put on, the fewer results you will get. It is almost impossible to do a perfect search so if more than half of your articles are relevant, you are doing it right. Remember that bibliographic records (non-full text) can be obtained through Interlibrary Loan (ILL) free of charge.
By following these steps you can improve your search strategy: