Google has buttressed its popular search service, adding millions of new documents to its database and expanding international navigation, the company said Thursday. Google now indexes just more than 3 billion Web pages, up from the roughly 2.2 billion documents last publicized by the Mountain View, Calif.-based company. About 40 percent of the pages in Google's purview are authored in non-English languages, including Polish and Thai, for which it built new Web sites. Google doesn't expect to sacrifice speed for scope, however. "Even with the recent growth in the index, Google still delivers a list of relevant results in less than half a second," said Google spokesman Nate Tyler.