Perhaps you should try some spelling variations:
"4x400 metres relay" » "4x400 mestres relay", "4x400 metros relay", "4x400 metres delay", "4x400 metres pelay", "4x400 metres reay", "4x400 metres reglay", "4x400 metres velay", "4x400 metres belay"
"4x400 metres rela" » "4x400 mestres rela", "4x400 metros rela", "4x400 metres regla", "4x400 metres vela", "4x400 metres bela"
"4x400 metres dela" » "4x400 mestres dela", "4x400 metros dela", "4x400 metres della", "4x400 metres delia", "4x400 metres adela"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("4x400 metres relay") OR ((("4x400 metres rela") OR ("4x400 metres dela"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"4x400 metres relay\") OR (((\"4x400 metres rela\") OR (\"4x400 metres dela\"))))".
• Removing quotes may allow a broader search: (( 4x400 metres relay ) OR ((( 4x400 metres rela ) OR ( 4x400 metres dela )))).
• Adding a wildcard symbol may retrieve word variants: (("4x400 metres relay") OR ((("4x400 metres rela") OR ("4x400 metres dela"))))*.