Perhaps you should try some spelling variations:
"series estudios urbano." » "serie estudios urbano.", "seis estudios urbano.", "tres estudios urbano.", "series estudios urbanos.", "series estudios peruanos.", "series estudios hispano.", "serie estudioss urbano.", "senales estudios urbano."
"herrera eduardo hispano." » "herrera pardo hispano.", "herrera gerardo hispano.", "herrera ricardo hispano.", "herrera eduardo pizano.", "herrera eduardo riano.", "herrera eduardo toscano."
"series estudio urbano." » "serie estudio urbano.", "serie estudios urbano.", "senales estudio urbano.", "series estudios urbanos.", "series espacio urbano."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("series estudios urbano.") or ("series estudio urbano."))) or ("herrera eduardo hispano."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("series estudios urbano.") OR ("series estudio urbano."))) OR ("herrera eduardo hispano.")).
• Removing quotes may allow a broader search: (((( series estudios urbano. ) or ( series estudio urbano. ))) or ( herrera eduardo hispano. )).
• Adding a wildcard symbol may retrieve word variants: (((("series estudios urbano.") or ("series estudio urbano."))) or ("herrera eduardo hispano."))*.