Perhaps you should try some spelling variations:
22christian union » christian union, christian unity
christian upon » christians upon, christian union, christianity upon
reef history » brief history, reeves history, reef fishery
21 germany » 2.1 germany, 11 germany, 20 germany
2 germany » 12 germany, 7 germany, 2 german
2023 20th » 2023 26th, 2023 10th, 2020 20th
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: %((22christian union) OR (christian upon)) conversations %((2 germany) OR (21 germany)) %reef history %((2f 20th) OR (2023 20th)) century%22.
• Adding a wildcard symbol may retrieve word variants: %((22christian union) or (christian upon)) conversations %((2 germany) or (21 germany)) %reef history %((2f 20th) or (2023 20th)) century%22*.