Perhaps you should try some spelling variations:
21 germany » 2.1 germany, 11 germany, 2 germany
25 germany » 5 germany, 2 germany, 26 germany
20 germany » 2 germany, 7 germany, 8 germany
2f history » imf history, etf history, ref history

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: %22music in education %((((21 germany) OR (25 germany))) OR (20 germany)) %((2f history) OR (brief history))%22.
• Adding a wildcard symbol may retrieve word variants: %22music in education %((((21 germany) or (25 germany))) or (20 germany)) %((2f history) or (brief history))%22*.