Perhaps you should try some spelling variations:
"dos estudios cervantinos." » "dos estudios mercantiles.", "dos estudios criticos.", "dos estudios andinos."
"los estudios peruanos." » "los estudios americanos.", "los estudios ensayos."
"leyes estudios urbanos." » "series estudios urbanos.", "seis estudios urbanos.", "tres estudios urbanos."

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 urbanos.") or ((("dos estudios cervantinos.") or ("los estudios peruanos."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("leyes estudios urbanos.") OR ((("dos estudios cervantinos.") OR ("los estudios peruanos."))))*.
• Removing quotes may allow a broader search: (( leyes estudios urbanos. ) or ((( dos estudios cervantinos. ) or ( los estudios peruanos. ))))*.