Perhaps you should try some spelling variations:
roman conversations » design conversations
from conversations » from conversation, from conversational, bot conversations
20th century » 18th century
reef history » reeves history, reef fishery, imf history
bief history » brief hystory, imf history, ref history
etf history » imf history, ref history, tnf history
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
21 germany » 11 germany, 2 germany, 20 germany
2.2 20th » 2020 20th, 2023 20th, 2021 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: %christianity ((from conversations) OR (roman conversations)) %((21 germany) OR (2.1 germany)) %((etf history) OR (((((bief history) OR (reef history))) OR (brief history)))) %2.2 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christianity ((from conversations) or (roman conversations)) %((21 germany) OR (2.1 germany)) %((etf history) or (((((bief history) or (reef history))) or (brief history)))) %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %christianity ((from conversations) or (roman conversations)) %((21 germany) OR (2.1 germany)) %((etf history) or (((((bief history) or (reef history))) or (brief history)))) %2.2 20th century%22*.