Perhaps you should try some spelling variations:
christians among » christianity among, christians being, christians about
christians upon » christians from, christians being, christians under
20th century » 18th century
2.1 germany » 21 germany, 2017 germany, 9.13 germany
ref history » reef history, brief history, bief history
2.2 20th » 2020 20th, 2023 20th, 2021 20th

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christians upon) OR (christians among)) conversations %2.1 germany %ref history %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((christians upon) OR (christians among)) conversations %2.1 germany %ref history %2.2 20th century%22*.