Perhaps you should try some spelling variations:
christianity spoken » christianity taken, christianity stated, christianity book
christianity set » christianity both, christianity fast, christianity 18th
ref history » reef history, brief history, bief history
brief story » brief history, brief study
21 germany » 11 germany, 2 germany, 20 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: %((christianity spoken) OR (christianity set)) conversations %21 germany %((ref history) OR (brief story)) %2.2 ((20th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christianity spoken) OR (christianity set)) conversations %21 germany %((ref history) or (brief story)) %2.2 ((20th century) or (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %((christianity spoken) OR (christianity set)) conversations %21 germany %((ref history) or (brief story)) %2.2 ((20th century) or (18th century))%22*.