Perhaps you should try some spelling variations:
spoken conversations » spoken conversation, open conversations, oboen conversations
upon conversations » union conversations, open conversations, human conversations
bief history » brief history, brief hystory, imf history
20th century » 18th century
tnf history » imf history, etf history, motif history
ref history » reef history, brief history, imf history
21 germany » 11 germany, 2 germany, 20 germany
20 20th » 90 20th, 2019 20th, 2020 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)) %21 germany %((((tnf history) OR (ref history))) OR (bief history)) %20 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((upon conversations) OR (spoken conversations)) %21 germany %((((tnf history) or (ref history))) or (bief history)) %20 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) OR (spoken conversations)) %21 germany %((((tnf history) or (ref history))) or (bief history)) %20 20th century%22*.