The service lets people type in any keyword and receive results for all the pages and titles of various books that contain that term. In the past, Amazon customers could search only by author name, title or keyword. The search feature works with around 120,000 titles from 190 publishers, which translates into some 33 million pages of searchable text. Jeff Bezos, CEO of Amazon, said the program is "driving increased sales," and since launching, 37 additional publishers have shown interest in participating.