I'm also using an SQL Server backend, what I'm doing whenever I get multiple matches is pull them all (with a predefined limit), and the user can navigate through them with a standard navigation toolbar or a list. As far as the search form goes, I liked Nadya's idea of having a "type of search", I don't remember if she meant within the search form (an option group maybe) or another form before the actual search form, I like the first method.