Perhaps you should try some spelling variations:
union conversations » win conversations, design conversations, driven conversations
ref history » reef history, brief history, bief history
21 germany » 2.1 germany, 11 germany, 20 germany
2 germany » 12 germany, 7 germany, 2 german
2023 20th » 2023 26th, 2023 10th, 2023 24th
2020 20th » 2020 16th, 2020 2021, 2020 5th

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 union conversations %((21 germany) OR (2 germany)) %ref history %((2023 20th) OR (2020 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian union conversations %((21 germany) or (2 germany)) %ref history %((2023 20th) OR (2020 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %christian union conversations %((21 germany) or (2 germany)) %ref history %((2023 20th) OR (2020 20th)) century%22*.