I've wondered the same thing. It's frustrating when you type in "Beef stew" and both of those words aren't included in the results.
I've tried using quotes, I've tried using a plus sign. Neither works.
I've received ten pages of results, with my search words not even being in the top results. Having to search thru multiple pages and finding "beef stew" scattered thru all ten pages is maddening.
Why can't a boolean search be used in Fitday?