I think i know what you are doing. You are talking about your search, not the actual collection. It seems like it is giving you the results from your "All Items" Folder instead of within your new folder. If you do the search but instead choose "This Collection" instead of "All Collections" then it should work. if you do this and search for 1991, then all your 1991 cards will show up. If for some reason Topps is showing before Bowman or Donruss, then just double click the description header, this should sort the objects.
Good Luck
Good Luck