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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("synchronised swimming") or ("synchronize swimming"))) or ((("synchronised streaming") or ("synchronized stemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ("synchronize swimming"))) OR ((("synchronised streaming") OR ("synchronized stemming")))).
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ( synchronize swimming ))) or ((( synchronised streaming ) or ( synchronized stemming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ("synchronize swimming"))) or ((("synchronised streaming") or ("synchronized stemming"))))*.