Perhaps you should try some spelling variations:
"estudios humanisticos serie." » "estudios linguisticos serie.", "estudios humanistica series.", "estudios humanisticos sobre.", "estudios humanisticos en."
"estudios peruanos serie." » "estudios urbanos serie.", "estudios americanos serie.", "estudios ensayos serie.", "estudios verano serie."
"estudios mas serie." » "estudios a serie.", "estudios maior serie.", "estudios de serie.", "estudios mazas serie.", "estudios las series.", "estudios mayo serie."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("estudios peruanos serie.") or ("estudios humanisticos serie."))) or ("estudios mas serie."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("estudios peruanos serie.") OR ("estudios humanisticos serie."))) OR ("estudios mas serie.")).
• Removing quotes may allow a broader search: (((( estudios peruanos serie. ) or ( estudios humanisticos serie. ))) or ( estudios mas serie. )).
• Adding a wildcard symbol may retrieve word variants: (((("estudios peruanos serie.") or ("estudios humanisticos serie."))) or ("estudios mas serie."))*.