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