Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronism swimming", "synchronising swimming", "synchronised stemming"
"synchronised streaming" » "synchronized streaming", "synchronism streaming", "synchronising streaming"
"synchronizing swimming" » "synchronizing stemming", "synchronized swimming"
"synchronize treating" » "synchronized treating", "synchronism treating", "synchronize creating", "synchronize heating", "synchronize relating"

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