Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronising swimming", "synchronised stemming"
"synchronizing swimming" » "synchronizing stemming", "synchronized swimming"
"synchronize swimming" » "synchronize stemming", "synchronized swimming"
"synchronism steering" » "synchronising steering", "synchronized 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 ((("synchronism steering") or ("synchronizing swimming"))))) or ("synchronize swimming"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ((("synchronism steering") OR ("synchronizing swimming"))))) OR ("synchronize swimming")).
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ((( synchronism steering ) or ( synchronizing swimming ))))) or ( synchronize swimming )).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ((("synchronism steering") or ("synchronizing swimming"))))) or ("synchronize swimming"))*.