Perhaps you should try some spelling variations:
2f germany » 2 germany, 20 germany, 21 germany
2f history » imf history, etf history, ref history
2019 20th » 2019 4th, 2019 6th, 2019 5th
1994 20th » 1995 20th, 1999 20th, 1990 20th
90 20th » 20 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 %2f history %((2019 20th) OR (((90 20th) OR (1994 20th)))) century%22.
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %2f germany %2f history %((2019 20th) or (((90 20th) or (1994 20th)))) century%22*.