That still doesn't work, unless I'm misunderstanding. I have 'includes' set as the comparison, but even if I type 'tee ' with a space into the search field, it still returns all the products that include the work 'teeth' in the keywords. Also, I wouldn't want it set as a requirement for our visitors to have to type spaces after their final search term since that's not a common practice.
Am I doing something incorrectly?