it would be very helpful to be able to search for a presentation/lesson on the Activity Page, even if I do not know the exact name of the lesson (but I do know the chapter of my album that it is in).

Example: If present a lesson from the "Prelude to the Winds" subchapter in "The Work of Air" chapter in my Elementary Geography album, it would be fantastic if all of the lessons in the Work of Air chapter (Elementary Geography) would pop up when I type in #workofair. And it would be helpful if typing in #Prelude would bring up all lessons in the Prelude to the Winds Subchapter in the Work of Air chapter.