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