If you're looking for a specific item, the easiest way to track it down is by using the library catalogue, iDiscover. Type a few words from the book or article's title into the search box. If the article or book is available online (and many of them are) then you should be able to get to it directly by clicking 'Full text available'. If it isn't online, then iDiscover will tell you where the print copies can be found. If you're looking for articles on a given topic, add a few keywords to the search box on iDiscover. Be careful with your search terms, and try synonyms if you're not getting the results you hoped for.