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