Perhaps you should try some spelling variations:
"vieira ana investigacion" » "vieira una investigacion", "vieira para investigacion", "vieira en investigacion", "neira ana investigacion"
"ruecas la investigacion" » "ruedas la investigacion", "cuencas la investigacion", "cuevas 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("ruecas la investigacion") or ((("vieira la investigacion") OR ("vieira ana investigacion"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("ruecas la investigacion") OR ((("vieira la investigacion") OR ("vieira ana investigacion")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ruecas la investigacion\") or (((\"vieira la investigacion\") OR (\"vieira ana investigacion\"))))".
• Removing quotes may allow a broader search: (( ruecas la investigacion ) or ((( vieira la investigacion ) OR ( vieira ana investigacion )))).
• Adding a wildcard symbol may retrieve word variants: (("ruecas la investigacion") or ((("vieira la investigacion") OR ("vieira ana investigacion"))))*.