Perhaps you should try some spelling variations:
design conversations » design considerations, design construction, design conclusions
union conversations » win conversations, driven conversations, invent conversations
20th century » 18th century
reef history » brief history, reeves history, reef fishery
ref history » brief history, bief history, imf history
2.1 germany » 21 germany, 2017 germany, 9.13 germany
2f history » 2.1 history, imf history, etf history
20 germany » 2 germany, 7 germany, 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: %22christian ((union conversations) OR (design conversations)) %((20 germany) OR (2.1 germany)) %((2f history) OR (((ref history) OR (reef history)))) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((union conversations) or (design conversations)) %((20 germany) or (2.1 germany)) %((2f history) or (((ref history) OR (reef history)))) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((union conversations) or (design conversations)) %((20 germany) or (2.1 germany)) %((2f history) or (((ref history) OR (reef history)))) %2f 20th century%22*.