Perhaps you should try some spelling variations:
"beiras en investigacion" » "beiras e investigacion", "beiras la investigacion", "beiras ciencia investigacion", "letras en investigacion"
"negras en investigacion" » "negras e investigacion", "negras la investigacion", "negras ciencia investigacion", "negra en investigacion", "negros en investigacion", "negro en investigacion"
"meiras de investigacion" » "meiras la investigacion", "mentiras de investigacion", "detras de investigacion", "eras de investigacion"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("beiras en investigacion") OR ("negras en investigacion"))) OR ("meiras de investigacion"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"beiras en investigacion\") OR (\"negras en investigacion\"))) or (\"meiras de investigacion\"))~".
• Removing quotes may allow a broader search: (((( beiras en investigacion ) OR ( negras en investigacion ))) or ( meiras de investigacion ))~.
• Adding a wildcard symbol may retrieve word variants: (((("beiras en investigacion") OR ("negras en investigacion"))) or ("meiras de investigacion"))*.