Well, going to the search page illuminated something, but I don't know what.
If I search on "wire" then a little "search" glyph appears as I type it, and a search works.
If I search on my favorite nonsense word ("blognozzle") the search is executed, and comes up with nothing (as expected).
If I search on "3D" I never get the little "search" glyph, and hitting the enter key doesn't work. Which is frustrating, because I want to learn what's out there about 3D.
However, if I search on "3D wire" I get a bunch of results. I'm pretty sure this is stuff that has "3D" and "wire" in them, because "3D blognozzle" gets nothing. Perhaps I should search on "3D the".