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

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