Perhaps you should try some spelling variations:
christian unity » christian laity, christian divinity, christian charity
ref history » reef history, brief history, bief history
21 germany » 2 germany, 20 germany, 7 germany
11 germany » 11 german, 1918 germany, 7 germany
2f history » imf history, etf history, tnf history

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 unity) OR (christian union)) conversations %((21 germany) OR (11 germany)) %((2f history) OR (ref history)) %2.2 ((20th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christian unity) or (christian union)) conversations %((21 germany) or (11 germany)) %((2f history) or (ref history)) %2.2 ((20th century) OR (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %((christian unity) or (christian union)) conversations %((21 germany) or (11 germany)) %((2f history) or (ref history)) %2.2 ((20th century) OR (18th century))%22*.