Perhaps you should try some spelling variations:
upon conversations » union conversations, open conversations, spoken conversations
christian upon » christians upon, christian union, christianity upon
2.1 germany » 21 germany, 2017 germany, 9.13 germany
ref history » reef history, brief history, bief history
2021 20th » 2021 24th, 2020 20th, 2021 10th
2.2 20th » 2020 20th, 2023 20th, 2022 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 %ref history %((2.2 20th) OR (2021 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %christian upon conversations %2.1 germany %ref history %((2.2 20th) OR (2021 20th)) century%22*.