Perhaps you should try some spelling variations:
"4x400 metres relay" » "4x400 mestres relay", "4x400 metros relay", "4x400 metres rela", "4x400 metres delay", "4x400 metres reay"
"4x400 metres dela" » "4x400 mestres dela", "4x400 metros dela", "4x400 metres della", "4x400 metres delia", "4x400 metres adela"
"4x400 mestre pelay" » "4x400 maestre pelay", "4x400 muestreo pelay", "4x400 semestre pelay", "4x400 mestre pelayo", "4x400 mestre pelaya", "4x400 mestre play"

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 dela"))) OR ("4x400 mestre pelay"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"4x400 metres relay\") OR (\"4x400 metres dela\"))) OR (\"4x400 mestre pelay\"))*".
• Removing quotes may allow a broader search: (((( 4x400 metres relay ) OR ( 4x400 metres dela ))) OR ( 4x400 mestre pelay ))*.