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
21 germany » 11 germany, 2 germany, 20 germany
2021 20th » 2021 24th, 2020 20th, 2021 10th
1 german » 3 german, 2 german, 5 german
2.2 20th » 2020 20th, 2023 20th, 2022 20th

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 %((21 germany) OR (1 german)) %ref history %((2.2 20th) OR (2021 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian upon conversations %((21 germany) or (1 german)) %ref history %((2.2 20th) OR (2021 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %((21 germany) or (1 german)) %ref history %((2.2 20th) OR (2021 20th)) century%22*.