There are lots of ways that you can improve your search.
You can employ techniques to narrow your search, if you are finding too many results, or broaden your search, if you are not finding enough material. You can see some search tips here.
It is important to carefully consider the keywords that you use to search. Take time to think:
What is it that I want to find out? What search terms or keywords will find this information?
For more information on how to improve the effectiveness of your search, visit the Search Techniques guide, or contact your liaison librarian.