Google does not offer a Tor Hidden Service, but DDG does [1]. Not only can google not see my search query (unless I use !g instead of !sp), but not even my ISP knows what I'm looking for. There is a bit of lag for searches (5 whole seconds maybe), but those of us used to the way Tor works, this is not much of a problem at all.
There's also a Firefox Search Add-on [2], for those interested. I combine it with Foobar [3] for a more seamless and chrome-like interface.
[1] http://3g2upl4pq6kufc4m.onion/
[2] https://addons.mozilla.org/en-US/firefox/addon/duckduckgo-to...