This problem has been floated to me, and I must admit I'm stymied. Hoping someone here has relevant experience.
In a Google Custom Search Engine (CSE) the "Did you mean" functionality can be quite problematic for some websites, suggesting completely irrelevant choices or even a direct competitor - possibly thanks to Google's recently upgraded semantic processing.
So is there a way for a CSE to turn off that feature? There is a block list for specific sites, but that's not the same as not stopping the suggested search terms altogether.
There's an almost exact version of this question on
Google's CSE Help Forum [google.com], bit so far no response there from a Google person.