Perhaps you should try some spelling variations:
human conversations » human conversation, human conversational, roman conversations
open conversations » agent conversations, roman conversations, content conversations
brief hystory » brief history, brief herstory, brief story
reef history » brief history, reeves history, reef fishery
20th century » 18th century
ref history » brief history, bief history, imf history
21 germany » 11 germany, 2 germany, 20 germany
2023 20th » 2023 26th, 2023 10th, 2020 20th

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 ((human conversations) OR (open conversations)) %21 germany %((((ref history) OR (brief hystory))) OR (reef history)) %2023 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %christian ((human conversations) or (open conversations)) %21 germany %((((ref history) or (brief hystory))) or (reef history)) %2023 20th century%22*.