Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronised stemming"
"synchronism swimming" » "synchronism stemming", "synchronized swimming"
"synchronising swimming" » "synchronising stemming", "synchronizing swimming", "synchronisations swimming"
"synchronize swimming" » "synchronize stemming", "synchronized swimming", "synchronizing swimming"
"synchronising steering" » "synchronizing steering", "synchronisations steering"

You may be able to get more results by adjusting your search query.

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