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

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