Perhaps you should try some spelling variations:
"vieira ana investigacion" » "vieira una investigacion", "vieira para investigacion", "vieira en investigacion", "neira ana investigacion"
"cuentas la investigacion" » "cuentos la investigacion", "cuenta la investigacion", "cuencas la investigacion"
"vieira la investigacion" » "vieira de investigacion", "vieira e investigacion", "beira la 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: (("cuentas la investigacion") OR ((("vieira la investigacion") OR ("vieira ana investigacion"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cuentas la investigacion\") or (((\"vieira la investigacion\") OR (\"vieira ana investigacion\"))))~".
• Removing quotes may allow a broader search: (( cuentas la investigacion ) or ((( vieira la investigacion ) OR ( vieira ana investigacion ))))~.
• Adding a wildcard symbol may retrieve word variants: (("cuentas la investigacion") or ((("vieira la investigacion") OR ("vieira ana investigacion"))))*.