I think what you described is what they already have with the "including results for [similar wording]" version of the results page. They also have a link to see the exact results.
However, as of right now they only offer it for actual typos/spelling mistakes (like your example with the missing space) as opposed to semantically similar wordings.
However, as of right now they only offer it for actual typos/spelling mistakes (like your example with the missing space) as opposed to semantically similar wordings.