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 mercado hispano." » "herrera fernando hispano.", "herrera gerardo hispano.", "herrera mercado espanol."
"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.

You may be able to get more results by adjusting your search query.

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