Perhaps you should try some spelling variations:
bief history » brief history, brief hystory, reef history
imf history » brief history
ref history » reef history, brief history, etf history
21 germany » 2.1 germany, 11 germany, 20 germany
2 germany » 12 germany, 7 germany, 2 german
1990 20th » 1995 20th, 1999 20th, 1994 20th
20 20th » 90 20th, 2019 20th, 2020 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) OR (bief history)))) %((20 20th) OR (1990 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) OR (bief history)))) %((20 20th) or (1990 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((21 germany) or (2 germany)) %((imf history) or (((ref history) OR (bief history)))) %((20 20th) or (1990 20th)) century%22*.