Perhaps you should try some spelling variations:
21 philosophy » 2.1 philosophy, 23 philosophy, 24 philosophy
11 philosophy » 10 philosophy, 13 philosophy, 14 philosophy
3 philosophy » 5 philosophy
6 philosophy » 6 philosophie

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 %((((((21 philosophy) OR (11 philosophy))) OR (1 philosophy))) OR (((3 philosophy) OR (((2 philosophy) OR (6 philosophy))))))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22science %((((((21 philosophy) OR (11 philosophy))) or (1 philosophy))) or (((3 philosophy) or (((2 philosophy) or (6 philosophy))))))%22".
• Adding a wildcard symbol may retrieve word variants: %22science %((((((21 philosophy) OR (11 philosophy))) or (1 philosophy))) or (((3 philosophy) or (((2 philosophy) or (6 philosophy))))))%22*.