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

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