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