Perhaps you should try some spelling variations:
union conversations » win conversations, design conversations, driven conversations
wine conversation » wide conversation, wins conversation, nine conversations
reef history » brief history, reeves history, reef fishery
20 germany » 2 germany, 7 germany, 8 germany
21 germany » 11 germany, 2 germany, 7 germany
2021 18th » 2021 13th, 2021 16th, 2021 6th
2.2 18th » 2022 18th, 2023 18th, 2012 18th

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 ((union conversations) OR (wine conversation)) %((20 germany) OR (21 germany)) %reef history %((2.2 18th) OR (2021 18th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((union conversations) or (wine conversation)) %((20 germany) or (21 germany)) %reef history %((2.2 18th) OR (2021 18th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((union conversations) or (wine conversation)) %((20 germany) or (21 germany)) %reef history %((2.2 18th) OR (2021 18th)) century%22*.