Perhaps you should try some spelling variations:
"comentarios de codigo penal de 1995" » "comentario de codigo penal de 1995" (Expand Search), "comentarios al codigo penal de 1995" (Expand Search), "comentarios y codigo penal de 1995" (Expand Search), "comentarios del codigo penal de 1995" (Expand Search), "comentarios el codigo penal de 1995" (Expand Search), "comentarios de codigo penal de 1991" (Expand Search)
"comentarios a codigo penal de 1995" » "comentario a codigo penal de 1995" (Expand Search), "comentarios al codigo penal de 1995" (Expand Search), "comentarios ao codigo penal de 1995" (Expand Search), "comentarios y codigo penal de 1995" (Expand Search), "comentarios a codigo penal de 1991" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("comentarios de codigo penal de 1995") OR ("comentarios a codigo penal de 1995"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"comentarios de codigo penal de 1995\") OR (\"comentarios a codigo penal de 1995\"))".
• Removing quotes may allow a broader search: (( comentarios de codigo penal de 1995 ) OR ( comentarios a codigo penal de 1995 )).
• Adding a wildcard symbol may retrieve word variants: (("comentarios de codigo penal de 1995") OR ("comentarios a codigo penal de 1995"))*.