Perhaps you should try some spelling variations:
21 germany » 11 germany, 20 germany, 7 germany
12 germany » 11 germany, 12 german, 14 germany
2f history » imf history, etf history, ref history
2 germany » 7 germany, 2 german, 8 germany
2020 20th » 2020 16th, 2020 2021, 2020 5th
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 %((21 germany) OR (((2 germany) OR (12 germany)))) %2f history %((2020 20th) OR (90 20th)) century%22.
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((21 germany) or (((2 germany) or (12 germany)))) %2f history %((2020 20th) or (90 20th)) century%22*.