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

Try widening your search to All Fields.

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 ("cuencas la investigacion"))) or ("vieira ana investigacion"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ruecas la investigacion") OR ("cuencas la investigacion"))) OR ("vieira ana investigacion")).
• Removing quotes may allow a broader search: (((( ruecas la investigacion ) or ( cuencas la investigacion ))) or ( vieira ana investigacion )).
• Adding a wildcard symbol may retrieve word variants: (((("ruecas la investigacion") or ("cuencas la investigacion"))) or ("vieira ana investigacion"))*.