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

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