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