Perhaps you should try some spelling variations:
serious conversation » curious conversations, serious conideration, versus conversation
union conversations » win conversations, curious conversations, design conversations
20th century » 18th century
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
21 germany » 11 germany, 2 germany, 20 germany
2f history » imf history, etf history, ref history
2.2 20th » 2020 20th, 2023 20th, 2021 20th

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: "%22christian ((union conversations) OR (serious conversation)) %((21 germany) OR (2.1 germany)) %2f history %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) OR (serious conversation)) %((21 germany) OR (2.1 germany)) %2f history %2.2 20th century%22*.