Perhaps you should try some spelling variations:
20th century » 18th century
tnf history » ref history, motif history, stone history
imf history » brief history
etf history » reef history, ref history, beruf history
21 germany » 2.1 germany, 11 germany, 1 germany
20 germany » 8 germany, 5 germany, 6 germany
2f germany » 25 germany, 26 germany, 27 germany
2 germany » 12 germany, 2 german, 8 germany
2.2 20th » 2020 20th, 2023 20th, 2021 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 (20 germany))) OR (((2 germany) OR (7 germany))))) OR (21 germany)) %((((tnf history) OR (etf history))) OR (imf history)) %2.2 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((((2f germany) OR (20 germany))) or (((2 germany) or (7 germany))))) or (21 germany)) %((((tnf history) or (etf history))) or (imf history)) %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((((2f germany) OR (20 germany))) or (((2 germany) or (7 germany))))) or (21 germany)) %((((tnf history) or (etf history))) or (imf history)) %2.2 20th century%22*.