Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronize swimming", "synchronising swimming"
"synchronised flemming" » "synchronize flemming", "synchronising flemming", "synchronised fleming"
"synchronised streaming" » "synchronize streaming", "synchronising streaming", "synchronised treating"
"synchronized stemming" » "synchronized steering", "synchronized stepping", "synchronized stealing"
"synchronism streaming" » "synchronism treating", "synchronize streaming", "synchronising 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 stemming") or ("synchronised flemming"))) or ((("synchronised streaming") OR ("synchronism streaming"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronised swimming") OR ((((("synchronized stemming") OR ("synchronised flemming"))) OR ((("synchronised streaming") OR ("synchronism streaming")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"synchronised swimming\") or (((((\"synchronized stemming\") or (\"synchronised flemming\"))) or (((\"synchronised streaming\") OR (\"synchronism streaming\"))))))".
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((((( synchronized stemming ) or ( synchronised flemming ))) or ((( synchronised streaming ) OR ( synchronism streaming )))))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((((("synchronized stemming") or ("synchronised flemming"))) or ((("synchronised streaming") OR ("synchronism streaming"))))))*.