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

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