Perhaps you should try some spelling variations:
"estudios humanisticos desde." » "estudios linguisticos desde.", "estudios humanisticos serie.", "estudios humanisticas de.", "estudios humanisticos en."
"estudios peruanos de." » "estudios urbanos de.", "estudios americanos de.", "estudios ensayos de.", "estudios peruano de.", "estudios peruana de.", "estudios peruanos y."
"estudios las series." » "estudio las series.", "estudios mas series.", "estudios a series.", "estudios las sedes.", "estudios las especies."

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: (((("estudios peruanos de.") OR ("estudios humanisticos desde."))) OR ("estudios las series."))~.
• Removing quotes may allow a broader search: (((( estudios peruanos de. ) or ( estudios humanisticos desde. ))) or ( estudios las series. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("estudios peruanos de.") or ("estudios humanisticos desde."))) or ("estudios las series."))*.