This annoyance gets me frequently:
Type in the exact complete title of a resource into the command bar, and depending on what matching resources you have in your Library, sometimes the book you're trying to open doesn't even show up as one of the possible matches. The one this happens most frequently with is The Message, though I have noticed it other times too.

I have no idea what algorithm determines the order of matching resources in that list. But it's significantly different from the order in the "Search In" dropdown which is smart enough to put the exact match first:

The exact match should come first, then any other prioritized resources you have that match, then whatever order you determine for the remainder. For the "Search In" box, I see that you're putting already-open books up at the top of the list, which is fine, but below the line, in the "Top Resources" section, you should follow the same order as the command bar order, that is exact match first, then prioritized resources, then whatever else remains.