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