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

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 ((("synchronised stemming") or ("synchronised treating"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised swimming") OR ((("synchronised stemming") OR ("synchronised treating")))).
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((( synchronised stemming ) or ( synchronised treating )))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((("synchronised stemming") or ("synchronised treating"))))*.