Perhaps you should try some spelling variations:
"leyes estudios peruanoss." » "leyes estudios peruanos.", "leyes estudios urbanos.", "series estudios peruanoss.", "los estudios peruanoss.", "tres estudios peruanoss."
"seis estudios peruanoss." » "seis estudios peruanos.", "seis estudios urbanos.", "los estudios peruanoss.", "dos estudios peruanoss.", "dios estudios peruanoss."
"series espacio urbano." » "series spain urbano.", "versus espacio urbano.", "sociales espacio urbano.", "series espacio urbanismo."

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