Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronism swimming", "synchronised stemming"
"synchronized swimming" » "synchronized stemming"
"synchronismd swimming" » "synchronismd stemming", "synchronism swimming"
"synchronising swimming" » "synchronising stemming", "synchronizing swimming", "synchronism swimming", "synchronisations swimming"
"synchronize swimming" » "synchronize 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 ((("synchronized swimming") or ((("synchronismd swimming") OR ("synchronising swimming"))))))) or ("synchronize swimming"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ((("synchronized swimming") OR ((("synchronismd swimming") OR ("synchronising swimming"))))))) OR ("synchronize swimming")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised swimming\") or (((\"synchronized swimming\") or (((\"synchronismd swimming\") OR (\"synchronising swimming\"))))))) or (\"synchronize swimming\"))".
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ((( synchronized swimming ) or ((( synchronismd swimming ) OR ( synchronising swimming ))))))) or ( synchronize swimming )).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ((("synchronized swimming") or ((("synchronismd swimming") OR ("synchronising swimming"))))))) or ("synchronize swimming"))*.