If you want more control over your search results, use the Advanced Search option. The Advanced Search box can be accessed by clicking the ADVANCED SEARCH link to the right of the single search box. Here it is highlighted in red
The Advanced Search interface looks similar to the image below. Advanced Search helps you focus your search using multiple search terms or phrases and includes built-in boolean operators that help you narrow or broaden your search. You can choose whether to search for Books, Articles, and More; Library Catalog; and Course Reserves prior to entering search terms.