Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronism swimming", "synchronize swimming", "synchronising swimming"
"synchronised stemming" » "synchronism stemming", "synchronize stemming", "synchronising stemming", "synchronised streaming", "synchronised flemming", "synchronised stepping"
"synchronized stemming" » "synchronized streaming", "synchronized flemming", "synchronized 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 ((("synchronised stemming") or ((("synchronized stemming") OR ("synchronized steering"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised swimming") OR ((("synchronised stemming") OR ((("synchronized stemming") OR ("synchronized steering")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") or (((\"synchronised stemming\") or (((\"synchronized stemming\") OR (\"synchronized steering\"))))))".
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((( synchronised stemming ) or ((( synchronized stemming ) OR ( synchronized steering )))))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((("synchronised stemming") or ((("synchronized stemming") OR ("synchronized steering"))))))*.