Perhaps you should try some spelling variations:
25 germany » 5 germany, 20 germany, 26 germany
21 germany » 11 germany, 20 germany, 7 germany
2 germany » 7 germany, 2 german, 8 germany
2021 20th » 2021 24th, 2021 10th, 2023 20th
2020 20th » 2020 16th, 2020 2021, 2020 5th

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 (((21 germany) OR (2 germany)))) %brief history %((2021 20th) OR (2020 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((25 germany) or (((21 germany) OR (2 germany)))) %brief history %((2021 20th) or (2020 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((25 germany) or (((21 germany) OR (2 germany)))) %brief history %((2021 20th) or (2020 20th)) century%22*.