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

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