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

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