Perhaps you should try some spelling variations:
"estudios linguisticos desde." » "estudio linguistico desde.", "estudio sociolinguistico desde.", "estudios linguisticas desde.", "estudios linguistica desde.", "estudios linguisticos del."
"estudios ensayos serie." » "estudios etnicos serie.", "estudios ensayos sobre.", "estudios ensayos desde."
"estudios i serie." » "estudios e serie.", "estudios d serie.", "estudios _ serie.", "estudios ice serie.", "estudios la serie.", "estudios en 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 ensayos serie.") or ("estudios linguisticos desde."))) or ("estudios i serie."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("estudios ensayos serie.") OR ("estudios linguisticos desde."))) OR ("estudios i serie.")).
• Removing quotes may allow a broader search: (((( estudios ensayos serie. ) or ( estudios linguisticos desde. ))) or ( estudios i serie. )).
• Adding a wildcard symbol may retrieve word variants: (((("estudios ensayos serie.") or ("estudios linguisticos desde."))) or ("estudios i serie."))*.