I was searching for an email with the search term "photoshop" but when I hit ENTER, it interpreted that I wanted emails with 1) an image attachment (the "photos" part of "photoshop") and then 2) the text "hop" (what's left from the word "photoshop" when you remove "photos" from it). In the end, I had to open up gmail in the browser and search there to find the email I was looking for.