If you want to search for a specific title or a general subject area it is best to search the Library search tool. Make sure that "books and e-books" is selected. You can narrow your search to "e-resource" in the right column to find e-books. Click on the title to find a link to the book in full text.
You can also find e-books by searching e-book publishers' pages (see below). Then you have additional search options, such as the ability to search the entire text of your book and browse by topic.