Perhaps you should try some spelling variations:
serious conversation » curious conversations, serious conideration, versus conversation
22christian serious » christian sermons
ref history » reef history, brief history, bief history
21 germany » 11 germany, 2 germany, 20 germany
2020 20th » 2020 16th, 2020 5th, 2020 6th
2020 4th » 2020 5th, 2020 16th

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: %22christian serious conversation %21 germany %ref history %((((2020 20th) OR (2020 4th))) OR (2020 2021)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian serious conversation %21 germany %ref history %((((2020 20th) OR (2020 4th))) or (2020 2021)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian serious conversation %21 germany %ref history %((((2020 20th) OR (2020 4th))) or (2020 2021)) century%22*.