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

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