Perhaps you should try some spelling variations:
christian unity » christian laity, christian divinity, christian charity
20th century » 18th century
ref history » reef history, bief history, etf history
2f germany » 2 germany, 20 germany, 21 germany
2f 20th » 20 20th, 2.2 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 unity) OR (christian union)) conversations %2f germany %((imf history) OR (((ref history) OR (brief history)))) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christian unity) OR (christian union)) conversations %2f germany %((imf history) or (((ref history) or (brief history)))) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((christian unity) OR (christian union)) conversations %2f germany %((imf history) or (((ref history) or (brief history)))) %2f 20th century%22*.