Perhaps you should try some spelling variations:
"4x400 muestreos relay" » "4x400 muestreo relay", "4x400 muestreados relay", "4x400 nuestros relay", "4x400 muestreos pelay", "4x400 muestreos reay", "4x400 muestreos reglay", "4x400 muestreos velay", "4x400 muestreos delay"
"4x400 muestreos rela" » "4x400 muestreo rela", "4x400 muestreados rela", "4x400 nuestros rela", "4x400 muestreos regla", "4x400 muestreos vela", "4x400 muestreos dela"
"4x400 metres delay" » "4x400 mestres delay", "4x400 metros delay", "4x400 metres delany", "4x400 metres dela", "4x400 metres delas"

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

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