Perhaps you should try some spelling variations:
serious conversation » curious conversations, serious conideration, ingenious conversation
versus conversation » versus conversational, versus condensation, versus conservation
ref history » reef history, brief history, bief history
6th century » 16th century, 5th century, 18th century
2023 6th » 2023 5th, 2023 7th, 2023 8th

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 ((serious conversation) OR (versus conversation)) %7 germany %ref history %2023 6th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((serious conversation) OR (versus conversation)) %7 germany %ref history %2023 6th century%22*.