Narrowing search results

"The following documents also contained words you DID NOT search on." In the Bloug, Lou considers a comment from Rick Starbuck about using common words found in a search set that were not used in a search query in order to offer a way to narrow results. In the comments at the bottom of the page, Prentice offers that this is only one possible way to allow narrowing of results and offers a dozen more useful methods.