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