Perhaps you should try some spelling variations:
2017 germany » 17 germany, 2006 germany, 21 germany
20th century » 18th century
2.1 germany » 21 germany, 9.13 germany, 9.14 germany
imf history » brief history
20 germany » 2 germany, 7 germany, 8 germany
2f history » etf history, ref history, tnf history
20 20th » 90 20th, 2019 20th, 2020 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 (((2017 germany) OR (20 germany)))) %((2f history) OR (imf history)) %20 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((2.1 germany) or (((2017 germany) OR (20 germany)))) %((2f history) or (imf history)) %20 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2.1 germany) or (((2017 germany) OR (20 germany)))) %((2f history) or (imf history)) %20 20th century%22*.