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

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