Perhaps you should try some spelling variations:
serious conversation » curious conversations, serious conideration, versus conversation
union conversations » win conversations, curious conversations, design conversations
20th century » 18th century
2f germany » 20 germany, 21 germany, 25 germany
2f history » imf history, etf history, ref history
2 germany » 7 germany, 2 german, 8 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 ((union conversations) OR (serious conversation)) %((2f germany) OR (2 germany)) %2f history %2f 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %christian ((union conversations) or (serious conversation)) %((2f germany) or (2 germany)) %2f history %2f 20th century%22*.