Perhaps you should try some spelling variations:
20th century » 18th century
2f history » imf history, etf history, ref history
2 germany » 7 germany, 8 germany, 5 germany
1 germany » 11 germany, 12 germany, 14 germany
1 german » 3 german, 5 german, 7 german
2 german » 3 german, 5 german
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 %((((2 germany) OR (((1 germany) OR (1 german))))) OR (2 german)) %2f history %20 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((2 germany) or (((1 germany) or (1 german))))) or (2 german)) %2f history %20 20th century%22*.