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

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

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