Perhaps you should try some spelling variations:
2.1 germany » 21 germany, 2017 germany, 9.13 germany
8 germany » 7 germany, 1918 germany
2021 18th » 2021 13th, 2021 16th, 2021 6th
20 18th » 2017 18th, 2018 18th, 2019 18th

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 %((8 germany) OR (2.1 germany)) %brief history %((20 18th) OR (2021 18th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((8 germany) or (2.1 germany)) %brief history %((20 18th) OR (2021 18th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((8 germany) or (2.1 germany)) %brief history %((20 18th) OR (2021 18th)) century%22*.