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

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