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