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