Perhaps you should try some spelling variations:
christianity upon » christianity among, christianity along, christianity from
christian unity » christian union, christian laity, christian divinity
reef history » brief history, reeves history, reef fishery
21 germany » 11 germany, 2 germany, 20 germany
2 german » 3 german, 5 german

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: %((christianity upon) OR (christian unity)) conversations %((2 german) OR (21 germany)) %reef history %2f 18th century%22.
• Adding a wildcard symbol may retrieve word variants: %((christianity upon) or (christian unity)) conversations %((2 german) or (21 germany)) %reef history %2f 18th century%22*.