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