Having experience with running a phpBB2 forum, those are the default search functions. In order to have more options, Lost Marble would have to install a mod (as in modification) to the forum. Otherwise, it's not really possible.
It is quite silly, but you could always search title&text and then just look and see if your search query appears in any topic titles. Or better yet use Ctrl+F and make Mr.Internet Explorer do it for you
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