Perhaps you should try some spelling variations:
upon conversations » union conversations, spoken conversations, human conversations
open conversations » agent conversations, roman conversations, content conversations
21 germany » 11 germany, 2 germany, 20 germany
2021 20th » 2021 24th, 2020 20th, 2021 10th
2.2 20th » 2020 20th, 2023 20th, 2022 20th

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 conversations) OR (open conversations)) %21 germany %brief history %((2.2 20th) OR (2021 20th)) century%22*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((upon conversations) OR (open conversations)) %21 germany %brief history %((2.2 20th) or (2021 20th)) century%22*".