Perhaps you should try some spelling variations:
22christian design » christian designed
unchristian design » unchristian diversion, christian designed, unchristian usage
reef history » reeves history, reef fishery, imf history
20th century » 18th century
21 germany » 11 germany, 2 germany, 20 germany
2023 20th » 2023 26th, 2023 10th, 2020 20th

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: %((22christian design) OR (unchristian design)) conversations %21 germany %((brief history) OR (reef history)) %2023 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22christian design) OR (unchristian design)) conversations %21 germany %((brief history) or (reef history)) %2023 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((22christian design) OR (unchristian design)) conversations %21 germany %((brief history) or (reef history)) %2023 20th century%22*.