Perhaps you should try some spelling variations:
22christian union » christian union, christian upon
christian unity » christian union, christian laity, christian divinity
reef history » reeves history, reef fishery, imf history
21 germany » 2.1 germany, 11 germany, 2 germany
2023 20th » 2023 26th, 2020 20th, 2023 24th
2023 10th » 2022 10th, 2023 11th, 2013 10th

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: %((22christian union) OR (christian unity)) conversations %21 germany %((brief history) OR (reef history)) %((2023 20th) OR (2023 10th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22christian union) OR (christian unity)) conversations %21 germany %((brief history) or (reef history)) %((2023 20th) or (2023 10th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %((22christian union) OR (christian unity)) conversations %21 germany %((brief history) or (reef history)) %((2023 20th) or (2023 10th)) century%22*.