Gotcha. We might be able to do something similar to the (?) button next to the Add/Remove button in the Tags section (in the right hand column). When you click the ?, you get an explanation of the feature in a popover. If you think that would suffice, I'll put in a ticket for our engineering team. I can't promise it'll happen right away but it's a great suggestion! Thanks!
Originally Posted by comprex
That would be a start;
I was rather envisioning more of just the bottom "choosing keywords" section from that page combined with the search-engine specific details like proximity operators. ssh
had a (non-exhaustive?) post on here detailing these, but they got lost in the mix.