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

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 ("synchronised streaming"))) OR ("synchronism stepping"))) OR ("synchronised flemming"))))~.
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((((((( synchronised stemming ) or ( synchronised streaming ))) or ( synchronism stepping ))) or ( synchronised flemming ))))~.
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((((((("synchronised stemming") or ("synchronised streaming"))) or ("synchronism stepping"))) or ("synchronised flemming"))))*.