Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronism swimming"
"synchronising swimming" » "synchronizing swimming", "synchronism swimming"
"synchronisations stemming" » "synchronisation stemming", "synchronizations stemming", "synchronization stemming", "synchronisations streaming", "synchronisations steering", "synchronisations flemming"
"synchronize swimming" » "synchronized swimming", "synchronism swimming", "synchronizing 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 ((("synchronising swimming") or ("synchronisations stemming"))))) or ("synchronize swimming"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ((("synchronising swimming") OR ("synchronisations stemming"))))) OR ("synchronize swimming"))*.
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ((( synchronising swimming ) or ( synchronisations stemming ))))) or ( synchronize swimming ))*.