1. A method in a search term suggestion engine of a computing device, the method comprising: receiving characters of user data as the characters are input, wherein the user data is at least part of a search term to be provided to a first application to search for the search term, wherein the first application is one of multiple applications on the computing device; receiving, from the first application, an indication of multiple suggestion sources; obtaining, from each of two or more of the multiple suggestion sources, one or more suggested search terms based on the received characters; combining the one or more suggested search terms into a combined set of suggested search terms; and returning the combined set of suggested search terms to a search user interface for presentation to a user.