Perhaps you should try some spelling variations:
"estudios humanisticos en." » "estudios linguisticos en.", "estudios humanisticas en.", "estudios humanistico en.", "estudios humanistica en."
"estudios ensayos serie." » "estudios etnicos serie.", "estudios ensayos sobre.", "estudios ensayos desde."
"estudios mas series." » "estudios a series.", "estudios maior series.", "estudios de series.", "estudios las series.", "estudios das series.", "estudios mater series."

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

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