Perhaps you should try some spelling variations:
2 germany » 7 germany, 8 germany, 5 germany
2023 20th » 2023 26th, 2023 10th, 2023 24th
2020 20th » 2020 16th, 2020 2021, 2020 5th
2 german » 3 german, 5 german
20 20th » 2019 20th, 2021 20th, 2017 20th
90 20th » 94 20th, 1990 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 (2 german)) %brief history %((((20 20th) OR (((2023 20th) OR (2020 20th))))) OR (90 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((2 germany) OR (2 german)) %brief history %((((20 20th) or (((2023 20th) or (2020 20th))))) or (90 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2 germany) OR (2 german)) %brief history %((((20 20th) or (((2023 20th) or (2020 20th))))) or (90 20th)) century%22*.