Perhaps you should try some spelling variations:
20 germany » 2 germany, 7 germany, 5 germany
21 germany » 2 germany, 7 germany, 5 germany
11 germany » 11 german, 1918 germany, 7 germany
8 germany » 7 germany, 1918 germany
2021 20th » 2021 24th, 2020 20th, 2021 10th
2020 5th » 2020 16th

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 %((((20 germany) OR (8 germany))) OR (((21 germany) OR (11 germany)))) %brief history %((2021 20th) OR (2020 5th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((20 germany) OR (8 germany))) or (((21 germany) or (11 germany)))) %brief history %((2021 20th) or (2020 5th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((20 germany) OR (8 germany))) or (((21 germany) or (11 germany)))) %brief history %((2021 20th) or (2020 5th)) century%22*.