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