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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised swimming") OR ((((("synchronised stemming") OR ((("synchronised steering") OR ("synchronize steering"))))) OR ("synchronism stemming"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") or (((((\"synchronised stemming\") or (((\"synchronised steering\") OR (\"synchronize steering\"))))) or (\"synchronism stemming\"))))~".
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((((( synchronised stemming ) or ((( synchronised steering ) OR ( synchronize steering ))))) or ( synchronism stemming ))))~.
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((((("synchronised stemming") or ((("synchronised steering") OR ("synchronize steering"))))) or ("synchronism stemming"))))*.