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