Perhaps you should try some spelling variations:
22christian union » christian upon
christian unity » christian laity, christian divinity, christian charity
reef history » brief history, reeves history, reef fishery
20th century » 18th century
21 germany » 11 germany, 20 germany, 7 germany
2 germany » 7 germany, 2 german, 8 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: %((((22christian union) OR (christian union))) OR (christian unity)) conversations %((2 germany) OR (21 germany)) %reef history %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((22christian union) OR (christian union))) or (christian unity)) conversations %((2 germany) or (21 germany)) %reef history %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((((22christian union) OR (christian union))) or (christian unity)) conversations %((2 germany) or (21 germany)) %reef history %2f 20th century%22*.