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

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