Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronized swimming", "synchronising swimming"
"synchronize swimming" » "synchronized swimming"
"synchronism swimming" » "synchronising swimming", "synchronized swimming"
"synchronizing stemming" » "synchronized stemming", "synchronizing streaming", "synchronizing steering", "synchronizing flemming"

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