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