Perhaps you should try some spelling variations:
imf history » brief history
ref history » reef history, brief history, bief history
21 germany » 2.1 germany, 11 germany, 20 germany
2 germany » 12 germany, 7 germany, 2 german
20 20th » 2019 20th, 2020 20th, 2023 20th
90 20th » 94 20th, 1990 20th

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 germany)) %((imf history) OR (ref 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 germany)) %((imf history) or (ref history)) %((20 20th) OR (90 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((21 germany) or (2 germany)) %((imf history) or (ref history)) %((20 20th) OR (90 20th)) century%22*.