Perhaps you should try some spelling variations:
"estudios humanidades serie." » "estudios humanisticos serie.", "estudios humanidades tec.", "estudios humanidades en.", "estudios humanidades temas."
"estudios humanas serie." » "estudios mas serie."
"estudios las especies." » "estudio las especies.", "estudios mas especies.", "estudios a especies.", "estudios de 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 humanas serie.") OR ("estudios humanidades serie."))) or ("estudios las especies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("estudios humanas serie.") OR ("estudios humanidades serie."))) OR ("estudios las especies."))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"estudios humanas serie.\") OR (\"estudios humanidades serie.\"))) or (\"estudios las especies.\"))*".
• Removing quotes may allow a broader search: (((( estudios humanas serie. ) OR ( estudios humanidades serie. ))) or ( estudios las especies. ))*.