Perhaps you should try some spelling variations:
21 germany » 2 germany, 20 germany, 7 germany
11 germany » 11 german, 1918 germany, 7 germany
2f history » imf history, etf history, ref history
2021 18th » 2021 13th, 2021 6th, 2021 7th
2021 16th » 2020 16th, 2021 6th, 2021 13th

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) OR (11 germany)) %2f history %((2021 18th) OR (2021 16th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((21 germany) or (11 germany)) %2f history %((2021 18th) OR (2021 16th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((21 germany) or (11 germany)) %2f history %((2021 18th) OR (2021 16th)) century%22*.