Perhaps you should try some spelling variations:
20th century » 18th century
20 germany » 2 germany, 7 germany, 8 germany
2f history » imf history, etf history, ref history
2 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 %((20 germany) OR (((((2 german) OR (3 german))y) OR (((2 german) OR (3 german)))))) %2f history %20 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((20 germany) or (((((2 german) OR (3 german))y) or (((2 german) OR (3 german)))))) %2f history %20 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((20 germany) or (((((2 german) OR (3 german))y) or (((2 german) OR (3 german)))))) %2f history %20 20th century%22*.