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

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