Perhaps you should try some spelling variations:
christian upon » christians upon, christianity upon, christ upon
9.14 germany » 9.13 germany, 9.15 germany, 9.16 germany
20th century » 18th century
2.1 germany » 2017 germany, 9.13 germany, 9.15 germany
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: %((christian upon) OR (christian union)) conversations %((21 germany) OR (((2.1 germany) OR (9.14 germany)))) %ref history %2.2 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christian upon) or (christian union)) conversations %((21 germany) or (((2.1 germany) OR (9.14 germany)))) %ref history %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((christian upon) or (christian union)) conversations %((21 germany) or (((2.1 germany) OR (9.14 germany)))) %ref history %2.2 20th century%22*.