Perhaps you should try some spelling variations:
20th century » 18th century
tnf history » etf history, ref history, motif history
imf history » brief history
2 germany » 7 germany, 8 germany, 5 germany
2021 20th » 2021 24th, 2020 20th, 2021 10th
2 german » 3 german, 5 german

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 germany) OR (2 german)) %((tnf history) OR (imf history)) %2021 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2 germany) or (2 german)) %((tnf history) or (imf history)) %2021 20th century%22*.