Perhaps you should try some spelling variations:
"synchronize swimming" » "synchronized swimming", "synchronism swimming", "synchronizing swimming", "synchronize stemming"
"synchronize streaming" » "synchronized streaming", "synchronism streaming", "synchronizing streaming"
"synchronize treating" » "synchronized treating", "synchronism treating", "synchronizing treating", "synchronize creating", "synchronize heating", "synchronize relating"

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