Perhaps you should try some spelling variations:
agent conversations » late conversations
open conversations » roman conversations, content conversations, based conversations
reef history » brief history, reeves history, reef fishery
12 germany » 11 germany, 2 germany, 14 germany
12 german » 2 german, 2012 german
2023 18th » 2023 8th, 2023 11th, 2023 10th

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 ((open conversations) OR (agent conversations)) %((12 germany) OR (12 german)) %reef history %2023 18th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((open conversations) or (agent conversations)) %((12 germany) OR (12 german)) %reef history %2023 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((open conversations) or (agent conversations)) %((12 germany) OR (12 german)) %reef history %2023 18th century%22*.