Perhaps you should try some spelling variations:
spoken conversations » spoken conversation, open conversations, oboen conversations
upon conversations » union conversations, open conversations, human conversations
motion history » action history, fiction history, formation history
20th century » 18th century
etf history » reef history, tnf history, beruf history
imf history » brief history
ref history » reef history, brief history, bief history
2f germany » 2 germany, 20 germany, 21 germany
2f 20th » 20 20th, 2.2 20th

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