Perhaps you should try some spelling variations:
union conversations » win conversations, curious conversations, design conversations
wine conversation » wide conversation, wins conversation, nine conversations
ref history » reef history, bief history, imf history
20 germany » 2 germany, 7 germany, 8 germany
2020 18th » 2020 16th, 2020 15th, 2020 8th

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: %22christian ((union conversations) OR (wine conversation)) %20 germany %((brief history) OR (ref history)) %2020 18th century%22.
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) or (wine conversation)) %20 germany %((brief history) or (ref history)) %2020 18th century%22*.