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

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 ((("synchronised steering") or ("synchronism stemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised swimming") OR ((("synchronised steering") OR ("synchronism stemming")))).
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((( synchronised steering ) or ( synchronism stemming )))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((("synchronised steering") or ("synchronism stemming"))))*.