Perhaps you should try some spelling variations:
great conversations » agent conversations, chat conversations, creative conversations
bief history » brief history, brief hystory, imf history
20th century » 18th century
ref history » reef history, brief history, imf history
21 germany » 2.1 germany, 11 germany, 2 germany
2.2 20th » 2020 20th, 2023 20th, 2021 20th
%christianity » %christian

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: %christianity great conversations %21 germany %((ref history) OR (bief history)) %2.2 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %christianity great conversations %21 germany %((ref history) or (bief history)) %2.2 20th century%22*.