Perhaps you should try some spelling variations:
2.1 germany » 21 germany, 2017 germany, 9.13 germany
imf history » brief history
2f history » 2.1 history, etf history, ref history
2020 20th » 2020 4th, 2020 6th, 2020 15th

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 %((2f history) OR (imf history)) %((((((2020 20th) OR (2020 5th))) OR (2020 16th))) OR (2020 2021)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %2.1 germany %((2f history) or (imf history)) %((((((2020 20th) OR (2020 5th))) or (2020 16th))) or (2020 2021)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %2.1 germany %((2f history) or (imf history)) %((((((2020 20th) OR (2020 5th))) or (2020 16th))) or (2020 2021)) century%22*.