Perhaps you should try some spelling variations:
"estudios mecanisticos de." » "estudios humanisticos de.", "estudios criticos de.", "estudios linguisticos de.", "estudios mecanismico de.", "estudios mecanisticos en.", "estudios mecanismos de."
"estudios ensayos serie." » "estudios etnicos serie.", "estudios ensayos sobre.", "estudios ensayos 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.

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