Perhaps you should try some spelling variations:
christian opened » christ opened
christian open » christian open'd, christian popes, christian hope
bief history » brief hystory, imf history, reef history
2.1 germany » 21 germany, 2017 germany, 9.13 germany
2.2 18th » 2021 18th, 2022 18th, 2023 18th

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 %2.1 germany %((brief history) OR (bief history)) %2.2 18th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christian open) OR (christian opened)) conversations %2.1 germany %((brief history) or (bief history)) %2.2 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %((christian open) OR (christian opened)) conversations %2.1 germany %((brief history) or (bief history)) %2.2 18th century%22*.