Right now, it seems that it is only possible to search in titles. It would be very nice to be able to use keywords to search in all comments or text posts, to find posts/articles that you vaguely remember something about, but you can't remember the title name.
I'm wondering if it's intentional, in order to create more safety/privacy for users? If so, maybe it could be a function that's only available for registered user, perhaps of a certain level.