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

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