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

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