Perhaps you should try some spelling variations:
2.1 germany » 21 germany, 2017 germany, 9.13 germany
etf history » reef history, imf history, ref history
2f history » imf history, ref history, tnf history
2 germany » 7 germany, 2 german, 8 germany
2019 20th » 2019 4th, 2019 6th, 2019 5th
1990 20th » 1995 20th, 1999 20th, 1994 20th
20 20th » 90 20th, 2020 20th, 2023 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 %((2.1 germany) OR (2 germany)) %((2f history) OR (etf history)) %((((20 20th) OR (2019 20th))) OR (1990 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((2.1 germany) or (2 germany)) %((2f history) or (etf history)) %((((20 20th) OR (2019 20th))) or (1990 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2.1 germany) or (2 germany)) %((2f history) or (etf history)) %((((20 20th) OR (2019 20th))) or (1990 20th)) century%22*.