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