Perhaps you should try some spelling variations:
21 germany » 11 germany, 2 germany, 20 germany
2f history » imf history, etf history, ref history
2020 20th » 2020 16th, 2020 2021, 2020 5th
2023 20th » 2023 26th, 2023 10th, 2023 24th
2f 20th » 20 20th, 2.2 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 %21 germany %2f history %((2f 20th) OR (((((2020 20th) OR (2023 20th))) OR (20((2020 20th) OR (2023 20th)))))) century%22.
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %21 germany %2f history %((2f 20th) or (((((2020 20th) or (2023 20th))) or (20((2020 20th) or (2023 20th)))))) century%22*.