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