Perhaps you should try some spelling variations:
"synchronising swimming" » "synchronizing swimming", "synchronism swimming", "synchronisations 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 ((("synchronize stemming") or ("synchronize flemming"))))) or ("synchronized swimming"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronising swimming") OR ((("synchronize stemming") OR ("synchronize flemming"))))) OR ("synchronized swimming")).
• Removing quotes may allow a broader search: (((( synchronising swimming ) or ((( synchronize stemming ) or ( synchronize flemming ))))) or ( synchronized swimming )).
• Adding a wildcard symbol may retrieve word variants: (((("synchronising swimming") or ((("synchronize stemming") or ("synchronize flemming"))))) or ("synchronized swimming"))*.