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