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