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