You can use Locate (the online library catalogue) to search for books and ebooks. You can search for the title of a book, if you know it; an authors name; a mixture of author's name and title.
For example, if you want to find the book below: Advanced nutrition and dietetics in nutrition support by Hickson and Smith you could enter hickson advanced nutrition.
You can also search for books on a particular topic area e.g. diet therapy Use the box below to search Locate.
Books are often the best starting point for finding out about a subject which is new to you.