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

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