Perhaps you should try some spelling variations:
20th century » 18th century
21 germany » 7 germany, 8 germany, 5 germany
20 germany » 7 germany, 8 germany, 5 germany
11 germany » 11 german, 1918 germany, 7 germany
2f history » imf history, etf history, ref history
2 germany » 7 germany, 2 german, 8 germany
_ germany » _ 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 (20 germany))) OR (11 germany))) OR (((2 germany) OR (_ germany)))) %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 (20 germany))) or (11 germany))) or (((2 germany) or (_ germany)))) %2f history %20 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((((21 germany) OR (20 germany))) or (11 germany))) or (((2 germany) or (_ germany)))) %2f history %20 20th century%22*.