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

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 stemming") or ((((("synchronised streaming") OR ("synchronized streaming"))) or ("synchronism streaming"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised swimming") OR ((("synchronised stemming") OR ((((("synchronised streaming") OR ("synchronized streaming"))) OR ("synchronism streaming")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") or (((\"synchronised stemming\") or (((((\"synchronised streaming\") OR (\"synchronized streaming\"))) or (\"synchronism streaming\"))))))".
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((( synchronised stemming ) or ((((( synchronised streaming ) OR ( synchronized streaming ))) or ( synchronism streaming )))))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((("synchronised stemming") or ((((("synchronised streaming") OR ("synchronized streaming"))) or ("synchronism streaming"))))))*.