Perhaps you should try some spelling variations:
12 germany » 11 germany, 12 german, 14 germany
17 germany » 11 germany, 14 germany, 10 germany
26 germany » 6 germany, 20 germany, 21 germany
7 germany » _ germany
2 germany » _ germany, 2 german, 8 germany
5 germany » _ germany, 5 german, 8 germany
2f 20th » 2.2 20th
20 20th » 90 20th, 2019 20th, 2020 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 %((((((17 germany) OR (26 germany))) OR (((5 germany) OR (7 germany))))) OR (((2 germany) OR (12 germany)))) %((imf history) OR (brief history)) %((2f 20th) OR (20 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((((17 germany) or (26 germany))) or (((5 germany) OR (7 germany))))) or (((2 germany) or (12 germany)))) %((imf history) or (brief history)) %((2f 20th) or (20 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((((17 germany) or (26 germany))) or (((5 germany) OR (7 germany))))) or (((2 germany) or (12 germany)))) %((imf history) or (brief history)) %((2f 20th) or (20 20th)) century%22*.