Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronize swimming"
"synchronised stepping" » "synchronized stepping", "synchronize stepping", "synchronised stopping", "synchronised shopping", "synchronised shipping"
"synchronised steering" » "synchronized steering", "synchronize steering"
"synchronism stemming" » "synchronize stemming", "synchronized stemming", "synchronism streaming", "synchronism flemming", "synchronism stealing"
"synchronising swimming" » "synchronizing swimming", "synchronisations 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 ((("synchronism stemming") or ("synchronising swimming"))))) or ((("synchronised stepping") or ("synchronised steering"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ((("synchronism stemming") OR ("synchronising swimming"))))) OR ((("synchronised stepping") OR ("synchronised steering")))).
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ((( synchronism stemming ) or ( synchronising swimming ))))) or ((( synchronised stepping ) or ( synchronised steering )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ((("synchronism stemming") or ("synchronising swimming"))))) or ((("synchronised stepping") or ("synchronised steering"))))*.