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