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