Perhaps you should try some spelling variations:
20th century » 18th century
bief history » brief hystory, imf history, brief herstory
reef history » reeves history, reef fishery, imf history
ref history » imf history, etf history, tnf history
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
11 germany » 11 german, 1918 germany, 7 germany
21 germany » 2 germany, 20 germany, 7 germany
2.2 20th » 2020 20th, 2023 20th, 2021 20th
christianity » christian

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: %((christianity _) OR (christianity early)) conversations %((((21 germany) OR (2.1 germany))) OR (11 germany)) %((((ref history) OR (reef history))) OR (((bief history) OR (brief history)))) %2.2 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christianity _) or (christianity early)) conversations %((((21 germany) OR (2.1 germany))) or (11 germany)) %((((ref history) or (reef history))) or (((bief history) or (brief history)))) %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((christianity _) or (christianity early)) conversations %((((21 germany) OR (2.1 germany))) or (11 germany)) %((((ref history) or (reef history))) or (((bief history) or (brief history)))) %2.2 20th century%22*.