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

You may be able to get more results by adjusting your search query.

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