Perhaps you should try some spelling variations:
spoken conversations » spoken conversation, open conversations, oboen conversations
union conversations » win conversations, design conversations, driven conversations
upon conversations » open conversations, human conversations, oboen conversations
bief history » brief history, brief hystory, imf history
20th century » 18th century
etf history » reef history, imf history, ref history
2f germany » 2 germany, 20 germany, 25 germany
21 germany » 11 germany, 2 germany, 20 germany
2f 20th » 20 20th, 2.2 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 ((((upon conversations) OR (spoken conversations))) OR (union conversations)) %((2f germany) OR (21 germany)) %((etf history) OR (bief history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((((upon conversations) OR (spoken conversations))) or (union conversations)) %((2f germany) or (21 germany)) %((etf history) or (bief history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((((upon conversations) OR (spoken conversations))) or (union conversations)) %((2f germany) or (21 germany)) %((etf history) or (bief history)) %2f 20th century%22*.