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

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