Perhaps you should try some spelling variations:
unity conversations » union conversations, unit conversions, city conversation
party conversations » career conversations
reef history » reeves history, reef fishery, imf history
21 germany » 2.1 germany, 11 germany, 2 germany
2.2 18th » 2021 18th, 2022 18th, 2023 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 ((unity conversations) OR (party conversations)) %21 germany %((reef history) OR (brief history)) %2.2 18th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((unity conversations) OR (party conversations)) %21 germany %((reef history) or (brief history)) %2.2 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((unity conversations) OR (party conversations)) %21 germany %((reef history) or (brief history)) %2.2 18th century%22*.