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