Perhaps you should try some spelling variations:
win conversations » when conversations, ai conversations, wine conversation
ref history » reef history, brief history, bief history
20 germany » 2 germany, 7 germany, 8 germany
21 germany » 2.1 germany, 11 germany, 2 germany
2020 20th » 2020 16th, 2020 2021, 2020 5th
2023 20th » 2023 26th, 2023 10th, 2023 24th
2.2 20th » 2021 20th, 2022 20th, 2012 20th
2f 20th » 20 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: %22christian win conversations %((20 germany) OR (21 germany)) %ref history %((2f 20th) OR (((((2.2 20th) OR (2020 20th))) OR (2023 20th)))) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian win conversations %((20 germany) or (21 germany)) %ref history %((2f 20th) or (((((2.2 20th) OR (2020 20th))) or (2023 20th)))) century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian win conversations %((20 germany) or (21 germany)) %ref history %((2f 20th) or (((((2.2 20th) OR (2020 20th))) or (2023 20th)))) century%22*.