Perhaps you should try some spelling variations:
spoken conversations » spoken conversation, open conversations, oboen conversations
christian spoken » christian scorn, christian shore, christian steven
reef history » brief history, reeves history, reef fishery
20th century » 18th century
etf history » imf history, tnf history, beruf history
ref history » brief history, bief history, imf history
2f germany » 2 germany, 20 germany, 25 germany
21 germany » 2.1 germany, 11 germany, 2 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 spoken conversations %((2f germany) OR (21 germany)) %((etf history) OR (((ref history) OR (reef history)))) %20 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian spoken conversations %((2f germany) or (21 germany)) %((etf history) or (((ref history) OR (reef history)))) %20 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian spoken conversations %((2f germany) or (21 germany)) %((etf history) or (((ref history) OR (reef history)))) %20 20th century%22*.