Perhaps you should try some spelling variations:
"synchronize swimming" » "synchronize stemming"
"synchronism swimming" » "synchronism stemming", "synchronising swimming"
"synchronized flemming" » "synchronized fleming"
"synchronizing flemming" » "synchronizing 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 ("synchronism swimming"))) or ((("synchronized flemming") or ("synchronizing flemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronize swimming") OR ("synchronism swimming"))) OR ((("synchronized flemming") OR ("synchronizing flemming")))).
• Removing quotes may allow a broader search: (((( synchronize swimming ) or ( synchronism swimming ))) or ((( synchronized flemming ) or ( synchronizing flemming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronize swimming") or ("synchronism swimming"))) or ((("synchronized flemming") or ("synchronizing flemming"))))*.