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

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

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