Consider using a combination of 2 or more search terms.
Using a * will broaden your search. For example, searching for epidemic* will return results for epidemic and epidemics.
To see what the library has available in full-text, select underneath the search bar or to the left of your search results, depending on which database you are searching in.
When you surround your search terms with "quotation marks", you are telling the database that the words must appear as an exact phrase.
Consider using Boolean Search Terms AND, OR and NOT to combine search terms in order to broaden or limit search results. For example:
underneath the search bar or to the left of your search results, depending on which database you are searching in.