Perhaps you should try some spelling variations:
christians upon » christians among, christians from, christians being
christian upon » christian union, christianity upon, christ upon
bief history » brief history, brief hystory, imf history
ref history » reef history, brief history, imf history
21 germany » 11 germany, 2 germany, 20 germany
2020 18th » 2020 16th, 2020 15th, 2021 18th
2020 8th » 2020 5th, 2020 4th, 2020 6th

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) OR (christians upon)) conversations %21 germany %((ref history) OR (bief history)) %((2020 18th) OR (2020 8th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christian upon) or (christians upon)) conversations %21 germany %((ref history) or (bief history)) %((2020 18th) OR (2020 8th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %((christian upon) or (christians upon)) conversations %21 germany %((ref history) or (bief history)) %((2020 18th) OR (2020 8th)) century%22*.