Perhaps you should try some spelling variations:
motif history » motion history, motive history, motets history
reef history » reeves history, reef fishery
tnf history » etf history, ref history, stone history
2021 20th » 2021 24th, 2020 20th, 2021 10th
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 %2 german %((((((reef history) OR (brief history))) OR (((tnf history) OR (motif history))))) OR (imf history)) %((2f 20th) OR (2021 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %2 german %((((((reef history) or (brief history))) or (((tnf history) OR (motif history))))) or (imf history)) %((2f 20th) or (2021 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %2 german %((((((reef history) or (brief history))) or (((tnf history) OR (motif history))))) or (imf history)) %((2f 20th) or (2021 20th)) century%22*.