I was thinking more along the lines of natural language snippet creation. I think one of the key problems here remains that you go from a ~30 word (+your own identifiers) vocabulary to a English language vocabulary where you're not sure how to express something.

The example says constrain x. I wouldn't have searched for constrain, but for saturation, min-max, limit, or something along those lines. I'm not sure this will work as well if you don't use the right vocab.