Perhaps you should try some spelling variations:
2f germany » 2 germany, 20 germany, 21 germany
2f history » imf history, etf history, ref history
11 german » 1 german
2019 20th » 2019 4th, 2019 6th, 2019 5th
20 20th » 90 20th, 2020 20th, 2023 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 (11 german)) %2f history %((20 20th) OR (2019 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((2f germany) or (11 german)) %2f history %((20 20th) OR (2019 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2f germany) or (11 german)) %2f history %((20 20th) OR (2019 20th)) century%22*.