Perhaps you should try some spelling variations:
"4x400 muestreo velay" » "4x400 nuestro velay", "4x400 muestra velay", "4x400 muestran velay", "4x400 muestreo vela", "4x400 muestreo velas", "4x400 muestreo velar"
"4x400 muestreos regla" » "4x400 nuestros regla", "4x400 muestras regla", "4x400 muestrans regla", "4x400 muestreados regla"
"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 muestreo velay") OR ("4x400 muestreos regla"))) OR ("4x400 metres delay"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"4x400 muestreo velay\") OR (\"4x400 muestreos regla\"))) OR (\"4x400 metres delay\"))".
• Removing quotes may allow a broader search: (((( 4x400 muestreo velay ) OR ( 4x400 muestreos regla ))) OR ( 4x400 metres delay )).
• Adding a wildcard symbol may retrieve word variants: (((("4x400 muestreo velay") OR ("4x400 muestreos regla"))) OR ("4x400 metres delay"))*.