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

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