Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronize swimming"
"synchronised stemming" » "synchronized stemming", "synchronize stemming", "synchronised streaming", "synchronised flemming", "synchronised stealing"
"synchronised stepping" » "synchronized stepping", "synchronize stepping", "synchronised stopping", "synchronised shopping", "synchronised shipping"
"synchronised steering" » "synchronized steering", "synchronize steering"
"synchronism swimming" » "synchronize swimming", "synchronized swimming"
"synchronising swimming" » "synchronizing swimming", "synchronisations 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 ((("synchronism swimming") or ("synchronising swimming"))))) or ((((("synchronised stemming") OR ("synchronised stepping"))) or ("synchronised steering"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ((("synchronism swimming") OR ("synchronising swimming"))))) OR ((((("synchronised stemming") OR ("synchronised stepping"))) OR ("synchronised steering")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised swimming\") or (((\"synchronism swimming\") or (\"synchronising swimming\"))))) or (((((\"synchronised stemming\") OR (\"synchronised stepping\"))) or (\"synchronised steering\"))))".
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ((( synchronism swimming ) or ( synchronising swimming ))))) or ((((( synchronised stemming ) OR ( synchronised stepping ))) or ( synchronised steering )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ((("synchronism swimming") or ("synchronising swimming"))))) or ((((("synchronised stemming") OR ("synchronised stepping"))) or ("synchronised steering"))))*.