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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("synchronisations swimming") or ((("synchronizing swimming") or ("synchronism swimming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("synchronisations swimming") OR ((("synchronizing swimming") OR ("synchronism swimming"))))*.
• Removing quotes may allow a broader search: (( synchronisations swimming ) or ((( synchronizing swimming ) or ( synchronism swimming ))))*.