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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("synchronised swimming") or ("synchronize swimming"))) or ((("synchronised stemming") OR ("synchronism stemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ("synchronize swimming"))) OR ((("synchronised stemming") OR ("synchronism stemming")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised swimming\") or (\"synchronize swimming\"))) or (((\"synchronised stemming\") OR (\"synchronism stemming\"))))".
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ( synchronize swimming ))) or ((( synchronised stemming ) OR ( synchronism stemming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ("synchronize swimming"))) or ((("synchronised stemming") OR ("synchronism stemming"))))*.