Perhaps you should try some spelling variations:
"series estudioss peruanos." » "series estudios peruanos.", "seis estudios peruanos.", "serie estudio peruanos.", "serie estudos peruanos.", "seis estudioss peruanos.", "tres estudioss peruanos.", "leyes estudioss peruanos."
"serie estudios urbano." » "serie estudio urbano.", "serie estudios peruanos.", "serie estudios hispano."
"series estudios urbanos." » "series estudio urbanos.", "series estudios peruanoss.", "series estudios hispanos.", "seis estudios urbanos.", "tres estudios urbanos.", "leyes estudios urbanos."

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: (((("serie estudios urbano.") or ("series estudioss peruanos."))) or ("series estudios urbanos."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("serie estudios urbano.") OR ("series estudioss peruanos."))) OR ("series estudios urbanos.")).
• Removing quotes may allow a broader search: (((( serie estudios urbano. ) or ( series estudioss peruanos. ))) or ( series estudios urbanos. )).
• Adding a wildcard symbol may retrieve word variants: (((("serie estudios urbano.") or ("series estudioss peruanos."))) or ("series estudios urbanos."))*.