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