Perhaps you should try some spelling variations:
christian opened » christ opened
christian open » christian open'd, christian popes, christian hope
bief history » brief history, brief hystory, imf history
20th century » 18th century
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
ref history » reef history, brief history, imf history
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: %((christian open) OR (christian opened)) conversations %((21 germany) OR (2.1 germany)) %((ref history) OR (bief history)) %2.2 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christian open) OR (christian opened)) conversations %((21 germany) or (2.1 germany)) %((ref history) or (bief history)) %2.2 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((christian open) OR (christian opened)) conversations %((21 germany) or (2.1 germany)) %((ref history) or (bief history)) %2.2 20th century%22*.