Perhaps you should try some spelling variations:
reef history » reeves history, reef fishery
bief history » brief hystory, brief herstory, brief historic
20th century » 18th century
ref history » etf history, tnf history, reform history
21 germany » 2 germany, 20 germany, 7 germany
11 germany » 11 german, 1918 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 (11 germany)) %((((((ref history) OR (imf 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 (11 germany)) %((((((ref history) OR (imf 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 (11 germany)) %((((((ref history) OR (imf history))) or (reef history))) or (((bief history) or (brief history)))) %2.2 20th century%22*.