Perhaps you should try some spelling variations:
20th century » 18th century
21 germany » 11 germany, 20 germany, 8 germany
2 germany » 8 germany, 5 germany, 6 germany
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 %((7 germany) OR (((21 germany) OR (((2 germany) OR (2 german)))))) %((imf history) OR (brief history)) %20 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((7 germany) or (((21 germany) or (((2 germany) OR (2 german)))))) %((imf history) or (brief history)) %20 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((7 germany) or (((21 germany) or (((2 germany) OR (2 german)))))) %((imf history) or (brief history)) %20 20th century%22*.