The Library Catalog defaults to a Keyword search, which should work for most types of searches. The tabs at the top of the Catalog search can be clicked on to change the type of search.
Broad searches like the "alcohol abuse" search below can be focused by inserting AND followed by an idea that will limit the search, like: "alcohol abuse" AND college
Finding a Book in the Library
Once you find a title you'd like to track down, three key pieces of information to note are Location, Call Number, and Status.