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

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

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