Perhaps you should try some spelling variations:
human conversations » human conversation, human conversational, roman conversations
upon conversations » union conversations, spoken conversations, oboen conversations
open conversations » agent conversations, roman conversations, content conversations
bief history » brief history, brief hystory, imf history
ref history » reef history, brief history, imf history
2 germany » _ germany, 7 germany, 2 german

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 (human conversations))) OR (open conversations)) %2 germany %((ref history) OR (bief history)) %2.2 ((20th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((((upon conversations) OR (human conversations))) or (open conversations)) %2 germany %((ref history) or (bief history)) %2.2 ((20th century) or (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((((upon conversations) OR (human conversations))) or (open conversations)) %2 germany %((ref history) or (bief history)) %2.2 ((20th century) or (18th century))%22*.