Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronize swimming", "synchronised stemming"
"synchronising swimming" » "synchronising stemming", "synchronizing swimming", "synchronisations swimming"
"synchronism swimming" » "synchronism stemming", "synchronize swimming", "synchronized swimming"
"synchronising steering" » "synchronizing steering", "synchronisations steering"

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