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

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