Perhaps you should try some spelling variations:
20 germany » 8 germany, 5 germany, 6 germany
2f history » 2.1 history, imf history, etf history
2 germany » 12 germany, 2 german, 8 germany
2021 20th » 2021 24th, 2020 20th, 2021 10th
2019 20th » 2019 4th, 2019 6th, 2019 5th
90 20th » 20 20th, 1990 20th
94 20th » 4 20th, 94 24th, 1994 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 (((20 germany) OR (7 germany)))) %2f history %((((2021 20th) OR (2019 20th))) OR (((90 20th) OR (94 20th)))) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((2 germany) or (((20 germany) or (7 germany)))) %2f history %((((2021 20th) or (2019 20th))) or (((90 20th) OR (94 20th)))) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2 germany) or (((20 germany) or (7 germany)))) %2f history %((((2021 20th) or (2019 20th))) or (((90 20th) OR (94 20th)))) century%22*.