Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronising swimming"
"synchronised stemming" » "synchronized stemming", "synchronising stemming", "synchronised streaming", "synchronised steering", "synchronised flemming"
"synchronism swimming" » "synchronising swimming", "synchronized swimming"
"synchronize 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 ((("synchronize swimming") or ("synchronizing swimming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("synchronised swimming") OR ("synchronised stemming"))) OR ("synchronism swimming"))) OR ((("synchronize 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 (((\"synchronize swimming\") or (\"synchronizing swimming\"))))*".
• Removing quotes may allow a broader search: (((((( synchronised swimming ) OR ( synchronised stemming ))) or ( synchronism swimming ))) or ((( synchronize swimming ) or ( synchronizing swimming ))))*.