Perhaps you should try some spelling variations:
20th century » 18th century
imf history » brief history
11 german » 1 german
2 german » 3 german, 5 german
2f 20th » 20 20th, 2.2 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 %((((((2 german) OR (a german))y) OR (((2 german) OR (a german))))) OR (11 german)) %imf history %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((((2 german) OR (a german))y) or (((2 german) OR (a german))))) or (11 german)) %imf history %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((((2 german) OR (a german))y) or (((2 german) OR (a german))))) or (11 german)) %imf history %2f 20th century%22*.