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
20th century » 18th century
tnf history » imf history, etf history, motif history
ref history » reef history, brief history, imf history
2 germany » 7 germany, 2 german, 8 germany
20 20th » 90 20th, 2019 20th, 2020 20th

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 %2 germany %((((tnf history) OR (ref history))) OR (bief history)) %20 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christian upon) OR (christians upon)) conversations %2 germany %((((tnf history) or (ref history))) or (bief history)) %20 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((christian upon) OR (christians upon)) conversations %2 germany %((((tnf history) or (ref history))) or (bief history)) %20 20th century%22*.