Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronism swimming", "synchronising swimming"
"synchronised stemming" » "synchronized stemming", "synchronism stemming", "synchronising stemming", "synchronised steering", "synchronised flemming", "synchronised stepping"
"synchronize swimming" » "synchronized swimming", "synchronism swimming"
"synchronize streaming" » "synchronized streaming", "synchronism streaming", "synchronize treating"
"synchronizing swimming" » "synchronized swimming"

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: (((("synchronised swimming") OR ("synchronised stemming"))) OR ((((("synchronize swimming") OR ("synchronizing swimming"))) OR ("synchronize streaming"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised swimming\") OR (\"synchronised stemming\"))) or (((((\"synchronize swimming\") or (\"synchronizing swimming\"))) or (\"synchronize streaming\"))))~".
• Removing quotes may allow a broader search: (((( synchronised swimming ) OR ( synchronised stemming ))) or ((((( synchronize swimming ) or ( synchronizing swimming ))) or ( synchronize streaming ))))~.
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") OR ("synchronised stemming"))) or ((((("synchronize swimming") or ("synchronizing swimming"))) or ("synchronize streaming"))))*.