Perhaps you should try some spelling variations:
"estudios humanisticos serie." » "estudios linguisticos serie.", "estudios humanistica series.", "estudios humanisticos sobre.", "estudios humanisticos en."
"estudios urbanos serie." » "estudios humanos serie."
"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 humanisticos serie.") OR ("estudios urbanos serie."))) OR ("estudios las series."))~.
• Removing quotes may allow a broader search: (((( estudios humanisticos serie. ) or ( estudios urbanos serie. ))) or ( estudios las series. ))~.
• Adding a wildcard symbol may retrieve word variants: (((("estudios humanisticos serie.") or ("estudios urbanos serie."))) or ("estudios las series."))*.