Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronize swimming", "synchronising swimming"
"synchronised stemming" » "synchronized stemming", "synchronize stemming", "synchronising stemming", "synchronised streaming", "synchronised steering", "synchronised flemming"
"synchronism swimming" » "synchronize swimming", "synchronising swimming", "synchronized swimming"
"synchronizing swimming" » "synchronized 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 ("synchronised stemming"))) OR ((("synchronism swimming") OR ("synchronizing swimming"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised swimming\") OR (\"synchronised stemming\"))) OR (((\"synchronism swimming\") OR (\"synchronizing swimming\"))))".
• Removing quotes may allow a broader search: (((( synchronised swimming ) OR ( synchronised stemming ))) OR ((( synchronism swimming ) OR ( synchronizing swimming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") OR ("synchronised stemming"))) OR ((("synchronism swimming") OR ("synchronizing swimming"))))*.