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

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