Perhaps you should try some spelling variations:
spoken conversations » spoken conversation, open conversations, oboen conversations
upon conversations » union conversations, open conversations, human conversations
brief herstory » brief history, brief hystory, brief story
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany

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 ((upon conversations) OR (spoken conversations)) %21 germany %((ref history) OR (brief herstory)) %2.2 ((20th century) OR (18th century))%22.
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) or (spoken conversations)) %21 germany %((ref history) or (brief herstory)) %2.2 ((20th century) or (18th century))%22*.