Perhaps you should try some spelling variations:
christian unity » christian union, christian laity, christian divinity
christian upon » christians upon, christian union, christianity upon
bief history » brief history, brief hystory, reef history
2.1 germany » 21 germany, 2017 germany, 9.13 germany
tnf history » etf history, ref history, motif history
imf history » brief history
2f germany » 2 germany, 20 germany, 21 germany

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 (christian unity)) conversations %((2f germany) OR (2.1 germany)) %((tnf history) OR (((bief history) OR (imf history)))) %20 ((20th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christian upon) or (christian unity)) conversations %((2f germany) or (2.1 germany)) %((tnf history) or (((bief history) or (imf history)))) %20 ((20th century) OR (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %((christian upon) or (christian unity)) conversations %((2f germany) or (2.1 germany)) %((tnf history) or (((bief history) or (imf history)))) %20 ((20th century) OR (18th century))%22*.