Perhaps you should try some spelling variations:
2017 germany » 20 germany, 17 germany, 2006 germany
2.1 germany » 9.13 germany, 9.14 germany, 9.15 germany
ref history » reef history, bief history, etf history
21 germany » 11 germany, 2 germany, 20 germany
20 20th » 2019 20th, 2020 20th, 2023 20th
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) OR (((2.1 germany) OR (2017 germany)))) %((((ref history) OR (brief history))) OR (imf history)) %((20 20th) OR (90 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((21 germany) or (((2.1 germany) OR (2017 germany)))) %((((ref history) or (brief history))) or (imf history)) %((20 20th) or (90 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((21 germany) or (((2.1 germany) OR (2017 germany)))) %((((ref history) or (brief history))) or (imf history)) %((20 20th) or (90 20th)) century%22*.