Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronism swimming", "synchronised stemming"
"synchronised streaming" » "synchronized streaming", "synchronism streaming"
"synchronising swimming" » "synchronising stemming", "synchronizing swimming", "synchronism swimming", "synchronisations swimming"
"synchronize treating" » "synchronized treating", "synchronism treating", "synchronizing 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 ("synchronising swimming"))) or ((("synchronised streaming") or ("synchronize treating"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ("synchronising swimming"))) OR ((("synchronised streaming") OR ("synchronize treating")))).
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ( synchronising swimming ))) or ((( synchronised streaming ) or ( synchronize treating )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ("synchronising swimming"))) or ((("synchronised streaming") or ("synchronize treating"))))*.