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