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