Perhaps you should try some spelling variations:
22christian union » christian union, christian unity
christian upon » christians upon, christian union, christianity upon
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
2023 18th » 2023 8th, 2023 11th, 2023 10th
2.2 18th » 2021 18th, 2022 18th, 2012 18th

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 %21 germany %ref history %((2.2 18th) OR (2023 18th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22christian union) or (christian upon)) conversations %21 germany %ref history %((2.2 18th) OR (2023 18th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %((22christian union) or (christian upon)) conversations %21 germany %ref history %((2.2 18th) OR (2023 18th)) century%22*.