Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christian upon » christians upon, christian union, christianity upon
20th century » 18th century
2.1 germany » 2017 germany, 9.13 germany, 9.14 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian upon conversations %((2.1 germany) OR (21 germany)) %ref history %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %((2.1 germany) OR (21 germany)) %ref history %2.2 20th century%22*.