One little thing though: changing a search phrase or word and doing a new search, I notice the results do change, but there's no way to know if it really happened. Changing a Google search, the whole page flashes empty, that way I see/sense there's something new. In your case, a change is subtle, very subtle, too subtle. In one instance I had to look carefully to see the change in results.
Maybe adding a "you searched for X" is good enough, but I guess you can come up with a better way.