Perhaps you should try some spelling variations:
20th century » 18th century
imf history » brief history
21 germany » 11 germany, 20 germany, 8 germany
2f history » etf history, ref history, tnf history
5 germany » 5 german, 8 germany, 6 germany
2 germany » 8 germany, 6 germany, 4 germany
2 german » 3 german, 5 german
2f 20th » 20 20th, 2.2 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 %((((((5 germany) OR (7 germany))) OR (((2 germany) OR (2 german))))) OR (21 germany)) %((2f history) OR (imf history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((((5 germany) OR (7 germany))) or (((2 germany) or (2 german))))) or (21 germany)) %((2f history) or (imf history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((((5 germany) OR (7 germany))) or (((2 germany) or (2 german))))) or (21 germany)) %((2f history) or (imf history)) %2f 20th century%22*.