Perhaps you should try some spelling variations:
2f history » 2.1 history, imf history, etf history
21 germany » 2.1 germany, 11 germany, 2 germany
1994 14th » 1993 14th, 1994 15th, 1994 19th
1999 24th » 1999 4th, 1999 20th, 1999 29th
20 20th » 2019 20th, 2020 20th, 2023 20th
94 14th » 14 14th, 94 11th, 94 19th
90 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 %2f history %((20 20th) OR (((90 20th) OR (((94 14th) OR (((1994 14th) OR (1999 24th)))))))) century%22.
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %21 germany %2f history %((20 20th) or (((90 20th) or (((94 14th) or (((1994 14th) or (1999 24th)))))))) century%22*.