Perhaps you should try some spelling variations:
invent conversations » content conversations, violent conversations, agent conversations
design conversations » design considerations, design construction, design conclusions
union conversations » win conversations, driven conversations, second conversations
2.1 germany » 21 germany, 2017 germany, 9.13 germany
ref history » reef history, brief history, bief history
2.2 20th » 2020 20th, 2023 20th, 2021 20th
2f 20th » 20 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 (invent conversations))) OR (design conversations)) %((7 germany) OR (2.1 germany)) %ref history %((2f 20th) OR (2.2 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian ((((union conversations) OR (invent conversations))) or (design conversations)) %((7 germany) or (2.1 germany)) %ref history %((2f 20th) or (2.2 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian ((((union conversations) OR (invent conversations))) or (design conversations)) %((7 germany) or (2.1 germany)) %ref history %((2f 20th) or (2.2 20th)) century%22*.