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" » "synchronisation stemming", "synchronizations stemming", "synchronization stemming", "synchronisations streaming", "synchronisations steering", "synchronisations flemming"

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"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ("synchronize swimming"))) OR ("synchronisations stemming")).
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ( synchronize swimming ))) or ( synchronisations stemming )).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ("synchronize swimming"))) or ("synchronisations stemming"))*.