Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronism swimming"
"synchronised steering" » "synchronized steering", "synchronism steering"
"synchronising swimming" » "synchronizing swimming", "synchronism swimming", "synchronisations swimming"
"synchronize stemming" » "synchronized stemming", "synchronism stemming", "synchronizing stemming", "synchronize streaming", "synchronize flemming", "synchronize stepping"

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 ((("synchronised steering") OR ("synchronize stemming"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronised swimming\") OR (\"synchronising swimming\"))) OR (((\"synchronised steering\") OR (\"synchronize stemming\"))))".
• Removing quotes may allow a broader search: (((( synchronised swimming ) OR ( synchronising swimming ))) OR ((( synchronised steering ) OR ( synchronize stemming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") OR ("synchronising swimming"))) OR ((("synchronised steering") OR ("synchronize stemming"))))*.