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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("synchronising swimming") OR ("synchronisations swimming"))) or ((("synchronize swimming") or ("synchronize stemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronising swimming") OR ("synchronisations swimming"))) OR ((("synchronize swimming") OR ("synchronize stemming")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"synchronising swimming\") OR (\"synchronisations swimming\"))) or (((\"synchronize swimming\") or (\"synchronize stemming\"))))".
• Removing quotes may allow a broader search: (((( synchronising swimming ) OR ( synchronisations swimming ))) or ((( synchronize swimming ) or ( synchronize stemming )))).
• Adding a wildcard symbol may retrieve word variants: (((("synchronising swimming") OR ("synchronisations swimming"))) or ((("synchronize swimming") or ("synchronize stemming"))))*.