Perhaps you should try some spelling variations:
20th century » 18th century
21 germany » 11 germany, 2 germany, 20 germany
2f history » imf history, etf history, ref history
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 %((((21 germany) OR (((((11 german) OR (1 german))y) OR (((11 german) OR (1 german))))))) OR (2 german)) %2f history %20 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((21 germany) or (((((11 german) OR (1 german))y) or (((11 german) OR (1 german))))))) or (2 german)) %2f history %20 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((21 germany) or (((((11 german) OR (1 german))y) or (((11 german) OR (1 german))))))) or (2 german)) %2f history %20 20th century%22*.