Perhaps you should try some spelling variations:
22christian union » christian unity, christian upon
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
8 germany » 7 germany, 1918 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: %((22christian union) OR (christian union)) conversations %((8 germany) OR (21 germany)) %ref history %2f 18th century%22.
• Adding a wildcard symbol may retrieve word variants: %((22christian union) or (christian union)) conversations %((8 germany) or (21 germany)) %ref history %2f 18th century%22*.