Thanks for the note. We are actually reworking the search and adding some cool stuff to it shortly so I'll make sure this is looked at.
I tried searching for legendary/set items with "Movement speed" on them but it doesn't appear to work. Setting "Movement speed" to >= 0 returns all sorts of items that don't have movement speed on them, setting it to >= 6 (as in, 6%) returns no results, and setting it to 0.06 (maybe 1 is 100%?) returns no results. So hopefully your search changes fix things like this
Also...what's the point of searching for a "Rare"? they all have completely random stats on them o.O