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

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