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

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