Double quoting terms that should not be "corrected" works with the Google, even though it still offers you a correction, the initial set of results aren't corrected.
Prefixing with plus turns off correction with the Bing, which quite politely doesn't offer some obnoxious correction even after explicitly being told not to.
As an aside, Bing's fancy augmented search results page is much less annoying than Google's, even though it still has behaviour that triggers on mouse-over.