Perhaps you should try some spelling variations:
12 germany » 11 germany, 12 german, 2 germany
2f germany » 2 germany, 20 germany, 21 germany
_ germany » _ german
2019 20th » 2019 6th, 2019 5th, 2019 16th
20 20th » 2020 20th, 2023 20th, 2021 20th
90 20th » 94 20th, 1990 20th

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 %((((2f germany) OR (_ germany))) OR (12 germany)) %((imf history) OR (brief history)) %((20((20 20th) OR (2019 20th))) OR (((((((20 20th) OR (2019 20th))) OR (2019 4th))) OR (90 20th)))) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((2f germany) or (_ germany))) or (12 germany)) %((imf history) or (brief history)) %((20((20 20th) OR (2019 20th))) or (((((((20 20th) OR (2019 20th))) or (2019 4th))) or (90 20th)))) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((2f germany) or (_ germany))) or (12 germany)) %((imf history) or (brief history)) %((20((20 20th) OR (2019 20th))) or (((((((20 20th) OR (2019 20th))) or (2019 4th))) or (90 20th)))) century%22*.