What does Google mean by "books" and "literature"?

Because my personalized Google News page is set to locate stories about books & literature, I can find articles on J.K. Rowling and Russian publishers. Mostly it's very effective. However, the search function sometimes returns unexpected results. Today Google presented this article "Hospital's cost-shifting exposes bid to balance books" which uses "books" to mean business accounts and "literature" to mean scientific or scholarly research on the use of a certain medication.