Perhaps you should try some spelling variations:
2f philosophy » 23 philosophy, 24 philosophy, f philosophy
6 philosophie » der philosophie, die philosophie
2 philosophy » 1 philosophy
6 philosophy » 1 philosophy

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: %22science %((2f philosophy) OR (((a philosophy) OR (((2 philosophy) OR (((6 philosophy) OR (6 philosophie))))))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22science %((2f philosophy) or (((a philosophy) or (((2 philosophy) or (((6 philosophy) OR (6 philosophie))))))))%22".
• Adding a wildcard symbol may retrieve word variants: %22science %((2f philosophy) or (((a philosophy) or (((2 philosophy) or (((6 philosophy) OR (6 philosophie))))))))%22*.