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
ref history » reef history, brief history, imf history
21 germany » 11 germany, 2 germany, 20 germany
2021 20th » 2021 24th, 2020 20th, 2021 10th
2.2 20th » 2020 20th, 2023 20th, 2022 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 %((ref history) OR (bief history)) %((2.2 20th) OR (2021 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((christian open) or (christian opened)) conversations %21 germany %((ref history) or (bief history)) %((2.2 20th) OR (2021 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %((christian open) or (christian opened)) conversations %21 germany %((ref history) or (bief history)) %((2.2 20th) OR (2021 20th)) century%22*.