Perhaps you should try some spelling variations:
"synchronised swimming" » "synchronism swimming", "synchronize swimming", "synchronising swimming"
"synchronised flemming" » "synchronism flemming", "synchronize flemming", "synchronising flemming", "synchronised fleming"
"synchronised streaming" » "synchronism streaming", "synchronize streaming", "synchronising streaming"
"synchronised treating" » "synchronism treating", "synchronize treating", "synchronising treating", "synchronised creating", "synchronised heating", "synchronised relating"
"synchronized stemming" » "synchronized steering", "synchronized stepping", "synchronized stealing"

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 ("synchronised treating"))))))~.
• 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 ("synchronised treating")))))).
• 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 (\"synchronised treating\"))))))".
• Removing quotes may allow a broader search: (( synchronised swimming ) or ((((( synchronized stemming ) or ( synchronised flemming ))) or ((( synchronised streaming ) OR ( synchronised treating )))))).
• Adding a wildcard symbol may retrieve word variants: (("synchronised swimming") or ((((("synchronized stemming") or ("synchronised flemming"))) or ((("synchronised streaming") OR ("synchronised treating"))))))*.