Perhaps you should try some spelling variations:
22christian union » christian unity, christian upon
ref history » reef history, brief history, bief history
2 germany » 7 germany, 2 german, 8 germany
2.2 18th » 2021 18th, 2022 18th, 2023 18th

Try widening your search to All Fields.

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• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22christian union) OR (christian union)) conversations %2 germany %ref history %2.2 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %((22christian union) OR (christian union)) conversations %2 germany %ref history %2.2 18th century%22*.