Perhaps you should try some spelling variations:
"series estudioss peruanoss." » "series estudios peruanos.", "series estudios peruanoss.", "serie estudios peruanoss.", "seis estudios peruanoss."
"serie estudio urbano." » "serie estudios urbano.", "serie espacio urbano.", "series estudios urbano.", "serie studia urbano."
"dios estudios urbanos." » "dos estudios urbanos.", "los estudios urbanos.", "otros estudios urbanos."

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

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