Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronize swimming"
"synchronised streaming" » "synchronized streaming", "synchronize streaming", "synchronised treating"
"synchronised steering" » "synchronized steering", "synchronize steering"
"synchronism stemming" » "synchronize stemming", "synchronized stemming", "synchronism flemming", "synchronism stepping", "synchronism stealing"
"synchronising stemming" » "synchronising flemming", "synchronising stepping", "synchronising stealing", "synchronizing stemming", "synchronisations 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 ((((("synchronised streaming") OR ("synchronised steering"))) OR ((("synchronism stemming") OR ("synchronising stemming"))))))~.
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((((( synchronised streaming ) or ( synchronised steering ))) or ((( synchronism stemming ) or ( synchronising stemming ))))))~.
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((((("synchronised streaming") or ("synchronised steering"))) or ((("synchronism stemming") or ("synchronising stemming"))))))*.