Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronize swimming", "synchronising swimming"
"synchronised steering" » "synchronize steering", "synchronising steering"
"synchronised stepping" » "synchronize stepping", "synchronising stepping", "synchronised stopping", "synchronised shopping", "synchronised shipping"
"synchronism stepping" » "synchronism stopping", "synchronism shopping", "synchronism shipping", "synchronize stepping", "synchronising stepping"
"synchronized stemming" » "synchronized streaming", "synchronized stealing", "synchronized stenning"
"synchronized flemming" » "synchronized fleming"

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