Perhaps you should try some spelling variations:
20th century » 18th century
2.1 history » 1.1 history, 601 history
imf history » brief history
2f germany » 20 germany, 25 germany, 26 germany
21 germany » 11 germany, 20 germany, 8 germany
2f history » etf history, ref history, tnf history
2 germany » 8 germany, 5 germany, 6 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 %((((2f germany) OR (((((2 germany) OR (2 german))) OR (7 germany))))) OR (21 germany)) %((((2f history) OR (2.1 history))) OR (imf history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((2f germany) or (((((2 germany) or (2 german))) or (7 germany))))) or (21 germany)) %((((2f history) OR (2.1 history))) or (imf history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((2f germany) or (((((2 germany) or (2 german))) or (7 germany))))) or (21 germany)) %((((2f history) OR (2.1 history))) or (imf history)) %2f 20th century%22*.