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

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 swimming"))) or ((("synchronize stemming") or ("synchronism stemming"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("synchronised swimming") OR ("synchronising swimming"))) OR ((("synchronize stemming") OR ("synchronism stemming"))))*.
• Removing quotes may allow a broader search: (((( synchronised swimming ) or ( synchronising swimming ))) or ((( synchronize stemming ) or ( synchronism stemming ))))*.