result relevance for search engine

doing a search engine for part of an app i'm doing in vb/asp/sql...

in my advanced searches, my vb code optimizes the queries so they're not overly large (some of the forms are rather big). as far as basic functionality the engine returns the correct results based on the criterion.

what i need is, obviously, the abillity to present the results in order of relevance to your search terms. more specifically, a fast way to do it.