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