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

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