If you don't have any luck searching for your specific topic, try going a little more general. For example, if searching for the Innuits, you might have to look under Eskimos, or even Alaska - History
When you go to the bookshelves, look around. You will often find several more books on the same topic shelved nearby.
Once you find a book, be sure to look in the index so that you find every mention of your topic.
And don't forget your citation!