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

You may be able to get more results by adjusting your search query.

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