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 flemming", "synchronised stepping"
"synchronism steering" » "synchronize steering", "synchronising steering", "synchronized steering"

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 steering"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") OR (((\"synchronised stemming\") OR (\"synchronism steering\"))))*".
• Removing quotes may allow a broader search: (( synchronised swimming ) OR ((( synchronised stemming ) OR ( synchronism steering ))))*.