Perhaps you should try some spelling variations:
union conversations » win conversations, curious conversations, design conversations
upon conversations » open conversations, spoken conversations, human conversations
brief hystory » brief history, brief herstory, brief story
20th century » 18th century
2.1 germany » 21 germany, 2017 germany, 9.13 germany
ref history » reef history, brief history, bief history
2020 20th » 2020 16th, 2020 5th, 2020 2021

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 conversations) OR (union conversations)) %2.1 germany %((ref history) OR (brief hystory)) %2020 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((upon conversations) OR (union conversations)) %2.1 germany %((ref history) or (brief hystory)) %2020 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) OR (union conversations)) %2.1 germany %((ref history) or (brief hystory)) %2020 20th century%22*.