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

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("synchronised swimming") or ((("synchronize stemming") or ("synchronism flemming"))))) or ("synchronized swimming"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ((("synchronize stemming") OR ("synchronism flemming"))))) OR ("synchronized swimming")).
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ((( synchronize stemming ) or ( synchronism flemming ))))) or ( synchronized swimming )).
• Adding a wildcard symbol may retrieve word variants: (((("synchronised swimming") or ((("synchronize stemming") or ("synchronism flemming"))))) or ("synchronized swimming"))*.