Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christian upon » christians upon, christian union, christianity upon
ref history » reef history, brief history, bief history
12 germany » 11 germany, 2 germany, 14 germany
12 german » 2 german, 2012 german
2.2 18th » 2021 18th, 2022 18th, 2023 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: %christian upon conversations %((12 germany) OR (12 german)) %ref history %2.2 18th century%22.
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %((12 germany) or (12 german)) %ref history %2.2 18th century%22*.