Perhaps you should try some spelling variations:
"neira ana investigacion" » "neira una investigacion", "neira para investigacion", "neira la investigacion", "vieira ana investigacion"
"beiras en investigacion" » "beiras e investigacion", "beiras la investigacion", "beiras ciencia investigacion", "letras en investigacion", "negras en investigacion"
"letras de investigacion" » "letras la investigacion", "detras de investigacion"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("beiras en investigacion") or ("neira ana investigacion"))) or ("letras de investigacion"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("beiras en investigacion") OR ("neira ana investigacion"))) OR ("letras de investigacion"))*.
• Removing quotes may allow a broader search: (((( beiras en investigacion ) or ( neira ana investigacion ))) or ( letras de investigacion ))*.