Perhaps you should try some spelling variations:
21 germany » 2.1 germany, 11 germany, 1 germany
20 germany » 7 germany, 8 germany, 5 germany
2f history » 2.1 history, imf history, etf history
2 germany » 12 germany, 7 germany, 2 german

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: %22agriculture AND state %((((21 germany) OR (20 germany))) OR (2 germany)) %2f history %20 ((20th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((21 germany) OR (20 germany))) or (2 germany)) %2f history %20 ((20th century) or (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((21 germany) OR (20 germany))) or (2 germany)) %2f history %20 ((20th century) or (18th century))%22*.