Perhaps you should try some spelling variations:
unity conversations » union conversations, party conversations, city conversation
unit conversions » unit conversion, units conversion, _ conversions
ref history » reef history, brief history, bief history
21 germany » 2.1 germany, 11 germany, 2 germany
1 germany » 11 germany, 12 germany, 14 germany
2021 20th » 2021 24th, 2020 20th, 2021 10th
1 german » 3 german, 5 german, 2 german
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 ((unity conversations) OR (unit conversions)) %((21 germany) OR (((1 germany) OR (1 german)))) %ref history %((2.2 20th) OR (2021 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((unity conversations) OR (unit conversions)) %((21 germany) or (((1 germany) or (1 german)))) %ref history %((2.2 20th) or (2021 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((unity conversations) OR (unit conversions)) %((21 germany) or (((1 germany) or (1 german)))) %ref history %((2.2 20th) or (2021 20th)) century%22*.