Perhaps you should try some spelling variations:
"series estudios peruanos." » "series estudios urbanos.", "series estudios americanos.", "series estudios ensayos.", "serie estudios peruanos.", "seis estudios peruanos.", "tres estudios peruanos."
"los estudios urbano." » "los estudios urbanos.", "los estudio urbano.", "los estudios hispano."
"series spain durango." » "series spain during.", "series espana durango.", "services spain durango.", "shrines spain durango.", "strikes spain durango."

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