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