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