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

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