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

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 stemming"))) or ("synchronised steering"))) or ("synchronized stemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised swimming") OR ((((((("synchronised stemming") OR ("synchronize stemming"))) OR ("synchronised steering"))) OR ("synchronized stemming"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") or (((((((\"synchronised stemming\") OR (\"synchronize stemming\"))) or (\"synchronised steering\"))) or (\"synchronized stemming\"))))*".
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((((((( synchronised stemming ) OR ( synchronize stemming ))) or ( synchronised steering ))) or ( synchronized stemming ))))*.