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

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 ("synchronismd swimming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised swimming") OR ((("synchronize swimming") OR ("synchronismd swimming")))).
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((( synchronize swimming ) or ( synchronismd swimming )))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((("synchronize swimming") or ("synchronismd swimming"))))*.