For example: I put parimion into Wikipedia's search box. It says: "Showing results for pavilion. (LINK:) Search instead for parimion." I click that link and it says: "There were no results matching the query."
The spelling correction is (sometimes) useful, but in my experience, the "search instead" link never ever gives any results. Indeed that link only seems to be offered when your typed text is not present in the entire wiki, and then it does the best-guess spelling for you.
Am I right? If so, what's the point of that "search instead" link, which is guaranteed to produce no results?