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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("synchronized swimming") or ("synchronize swimming"))) or ((("synchronism stemming") or ("synchronising streaming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronized swimming") OR ("synchronize swimming"))) OR ((("synchronism stemming") OR ("synchronising streaming")))).
• Removing quotes may allow a broader search: (((( synchronized swimming ) or ( synchronize swimming ))) or ((( synchronism stemming ) or ( synchronising streaming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronized swimming") or ("synchronize swimming"))) or ((("synchronism stemming") or ("synchronising streaming"))))*.