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

You may be able to get more results by adjusting your search query.

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