Perhaps you should try some spelling variations:
christian unity » christian union, christian laity, christian divinity
christian upon » christians upon, christian union, christianity upon
20th century » 18th century
bief history » brief history, brief hystory, ref history
reef history » brief history, reeves history, reef fishery
imf history » brief history
21 germany » 11 germany, 2 germany, 20 germany
2f germany » 2 germany, 20 germany, 25 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 upon)) conversations %((2f germany) OR (21 germany)) %((imf history) OR (((reef history) OR (bief history)))) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christian unity) or (christian upon)) conversations %((2f germany) OR (21 germany)) %((imf history) or (((reef history) or (bief history)))) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((christian unity) or (christian upon)) conversations %((2f germany) OR (21 germany)) %((imf history) or (((reef history) or (bief history)))) %2f 20th century%22*.