Perhaps you should try some spelling variations:
2f germany » 2 germany, 21 germany, 25 germany
20 germany » 2 germany, 7 germany, 8 germany
2f history » imf history, etf history, ref history
1 german » a german, 3 german, 5 german
2f 20th » 2.2 20th
20 20th » 90 20th, 2019 20th, 2020 20th

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 %((((2f germany) OR (20 germany))) OR (1 german)) %2f history %((2f 20th) OR (20 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((2f germany) or (20 germany))) or (1 german)) %2f history %((2f 20th) OR (20 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((2f germany) or (20 germany))) or (1 german)) %2f history %((2f 20th) OR (20 20th)) century%22*.