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

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