Perhaps you should try some spelling variations:
spoken conversations » spoken conversation, open conversations, oboen conversations
upon conversations » union conversations, open conversations, human conversations
brief hystory » brief history, brief herstory, brief story
reef history » brief history, reeves history, reef fishery
21 germany » 2.1 germany, 11 germany, 2 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: %christianity ((upon conversations) OR (spoken conversations)) %21 germany %((reef history) OR (brief hystory)) %2.2 ((20th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christianity ((upon conversations) OR (spoken conversations)) %21 germany %((reef history) or (brief hystory)) %2.2 ((20th century) or (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %christianity ((upon conversations) OR (spoken conversations)) %21 germany %((reef history) or (brief hystory)) %2.2 ((20th century) or (18th century))%22*.