Perhaps you should try some spelling variations:
20th century » 18th century
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
20 germany » 2 germany, 7 germany, 8 germany
21 germany » 11 germany, 2 germany, 26 germany
25 germany » 5 germany, 2 germany, 26 germany
2.2 20th » 2020 20th, 2023 20th, 2021 20th

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 (((((21 germany) OR (25 germany))) OR (2.1 germany)))) %brief history %2.2 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((20 germany) or (((((21 germany) OR (25 germany))) or (2.1 germany)))) %brief history %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((20 germany) or (((((21 germany) OR (25 germany))) or (2.1 germany)))) %brief history %2.2 20th century%22*.