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

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