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