Perhaps you should try some spelling variations:
synchronised » synchronized, synchronism
swimming » stemming
synchronising » synchronism
synchronisations » synchronisation, synchronizations, synchronization
synchronize » synchronized, synchronism
synchronizing » synchronized

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 ((( synchronising swimming ) or ( synchronisations swimming ))))) or ((( synchronize swimming ) OR ( synchronizing swimming ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( synchronised swimming ) OR ((( synchronising swimming ) OR ( synchronisations swimming ))))) OR ((( synchronize swimming ) OR ( synchronizing swimming ))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( synchronised swimming ) or ((( synchronising swimming ) or ( synchronisations swimming ))))) or ((( synchronize swimming ) OR ( synchronizing swimming ))))*".