Perhaps you should try some spelling variations:
union conversations » win conversations, design conversations, driven conversations
upon conversations » open conversations, spoken conversations, human conversations
bief history » brief history, brief hystory, ref history
reef history » brief history, reeves history, reef fishery
20th century » 18th century
imf history » brief history
21 germany » 11 germany, 2 germany, 20 germany
2020 20th » 2020 16th, 2020 2021, 2020 5th

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 ((upon conversations) OR (union conversations)) %21 germany %((imf history) OR (((bief history) OR (reef history)))) %2020 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((upon conversations) or (union conversations)) %21 germany %((imf history) or (((bief history) OR (reef history)))) %2020 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((upon conversations) or (union conversations)) %21 germany %((imf history) or (((bief history) OR (reef history)))) %2020 20th century%22*.