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

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 ((("synchronism stemming") OR ("synchronising stemming"))))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") or (((((\"synchronised stemming\") or (\"synchronised steering\"))) or (((\"synchronism stemming\") OR (\"synchronising stemming\"))))))~".
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((((( synchronised stemming ) or ( synchronised steering ))) or ((( synchronism stemming ) OR ( synchronising stemming ))))))~.
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((((("synchronised stemming") or ("synchronised steering"))) or ((("synchronism stemming") OR ("synchronising stemming"))))))*.