Perhaps you should try some spelling variations:
unity conversations » union conversations, party conversations, city conversation
unit conversions » unit conversion, units conversion, _ conversions
imf history » brief history
21 germany » 11 germany, 20 germany, _ germany
2 germany » _ germany, 7 germany, 2 german
2f 20th » 2.2 20th
20 20th » 90 20th, 2019 20th, 2020 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)) %((2 germany) OR (21 germany)) %imf history %((2f 20th) OR (20 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%christian ((unity conversations) OR (unit conversions)) %((2 germany) or (21 germany)) %imf history %((2f 20th) or (20 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %christian ((unity conversations) OR (unit conversions)) %((2 germany) or (21 germany)) %imf history %((2f 20th) or (20 20th)) century%22*.