Perhaps you should try some spelling variations:
21 germany » 2.1 germany, 11 germany, 20 germany
2 germany » 12 germany, 7 germany, 2 german
2020 20th » 2020 2021, 2020 4th, 2020 6th
2.2 20th » 2023 20th, 2021 20th, 2022 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 %((2 germany) OR (21 germany)) %brief history %((2.2 20th) OR (((((2020 20th) OR (2020 16th))) OR (2020 5th)))) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((2 germany) or (21 germany)) %brief history %((2.2 20th) or (((((2020 20th) OR (2020 16th))) or (2020 5th)))) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2 germany) or (21 germany)) %brief history %((2.2 20th) or (((((2020 20th) OR (2020 16th))) or (2020 5th)))) century%22*.