Perhaps you should try some spelling variations:
2f history » 2.1 history, imf history, etf history
20 germany » 2 germany, 8 germany, 5 germany
25 germany » 5 germany, 2 germany, 21 germany
2019 20th » 2019 4th, 2019 6th, 2019 5th
2020 20th » 2020 16th, 2020 5th, 2020 4th
94 20th » 4 20th, 90 20th, 1994 20th
94 24th » 94 4th, 94 14th, 24 24th

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 %((25 germany) OR (((20 germany) OR (7 germany)))) %2f history %((((((2020 20th) OR (2020 2021))) OR (2019 20th))) OR (((94 20th) OR (94 24th)))) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((25 germany) or (((20 germany) or (7 germany)))) %2f history %((((((2020 20th) OR (2020 2021))) or (2019 20th))) or (((94 20th) or (94 24th)))) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((25 germany) or (((20 germany) or (7 germany)))) %2f history %((((((2020 20th) OR (2020 2021))) or (2019 20th))) or (((94 20th) or (94 24th)))) century%22*.