Perhaps you should try some spelling variations:
21 germany » 11 germany, 2 germany, 20 germany
2f history » imf history, etf history, ref history
2019 20th » 2019 4th, 2019 6th, 2019 16th
2019 5th » 2019 4th, 2019 6th
90 20th » 20 20th, 94 20th, 1990 20th
94 24th » 94 4th, 94 14th, 24 24th

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 %((((2019 20th) OR (2019 5th))) OR (((90 20th) OR (94 24th)))) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %21 germany %2f history %((((2019 20th) OR (2019 5th))) or (((90 20th) or (94 24th)))) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %21 germany %2f history %((((2019 20th) OR (2019 5th))) or (((90 20th) or (94 24th)))) century%22*.