Perhaps you should try some spelling variations:
2f bibliography » 22 bibliography, 23 bibliography, 20 bibliography
2f private » 2 private, 20 private, 21 private
22 private » 2.2 private, 2 private, 12 private
8 germany » 7 germany, 1918 germany
11 german » 1 german
2f berlin » 2 berlin, 21 berlin, 29 berlin

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %22humanities %2f bibliography %((2f private) OR (22 private)) collections %((8 germany) OR (11 german)) %2f berlin %art catalogs%22.
• Adding a wildcard symbol may retrieve word variants: %22humanities %2f bibliography %((2f private) or (22 private)) collections %((8 germany) or (11 german)) %2f berlin %art catalogs%22*.