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

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 ((("synchronized swimming") or ((("synchronized stemming") OR ("synchronized flemming"))))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised swimming") OR ((("synchronize swimming") OR ((("synchronized swimming") OR ((("synchronized stemming") OR ("synchronized flemming")))))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") or (((\"synchronize swimming\") or (((\"synchronized swimming\") or (((\"synchronized stemming\") OR (\"synchronized flemming\"))))))))".
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((( synchronize swimming ) or ((( synchronized swimming ) or ((( synchronized stemming ) OR ( synchronized flemming )))))))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((("synchronize swimming") or ((("synchronized swimming") or ((("synchronized stemming") OR ("synchronized flemming"))))))))*.