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