Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronising swimming", "synchronised stemming"
"synchronised stepping" » "synchronized stepping", "synchronising stepping"
"synchronised flemming" » "synchronized flemming", "synchronising flemming", "synchronised fleming"
"synchronised streaming" » "synchronized streaming", "synchronising streaming"
"synchronised treating" » "synchronized treating", "synchronising treating", "synchronised creating", "synchronised heating", "synchronised relating"
"synchronize swimming" » "synchronize stemming"
"synchronism swimming" » "synchronism stemming"

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 ("synchronism swimming"))))) or ((((("synchronised stepping") or ("synchronised flemming"))) 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 ("synchronism swimming"))))) OR ((((("synchronised stepping") OR ("synchronised flemming"))) OR ((("synchronised streaming") OR ("synchronised treating")))))).
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ((( synchronize swimming ) or ( synchronism swimming ))))) or ((((( synchronised stepping ) or ( synchronised flemming ))) or ((( synchronised streaming ) or ( synchronised treating )))))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ((("synchronize swimming") or ("synchronism swimming"))))) or ((((("synchronised stepping") or ("synchronised flemming"))) or ((("synchronised streaming") or ("synchronised treating"))))))*.