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

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