Perhaps you should try some spelling variations:
christians upon » christians among, christians from, christians being
christian upon » christian union, christianity upon, christ upon
20th century » 18th century
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
1 german » 3 german, 2 german, 5 german
2.2 20th » 2020 20th, 2023 20th, 2021 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) OR (christians upon)) conversations %((21 germany) OR (1 german)) %ref history %2.2 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christian upon) OR (christians upon)) conversations %((21 germany) or (1 german)) %ref history %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((christian upon) OR (christians upon)) conversations %((21 germany) or (1 german)) %ref history %2.2 20th century%22*.