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

You may be able to get more results by adjusting your search query.

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