Perhaps you should try some spelling variations:
instancias » instancia (Expand Search)
academicas." » academico." (Expand Search), academia." (Expand Search), academicoas." (Expand Search), academiaas." (Expand Search), academicos." (Expand Search)
academic." » academico." (Expand Search), academia." (Expand Search)
academica." » academicoa." (Expand Search), academiaa." (Expand Search), academico." (Expand Search)
academicos." » academicoos." (Expand Search), academiaos." (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "\"(sustancias OR instancias) (((academicas.\" OR academic.\") OR academica.\") OR academicos.\")~".
• Removing quotes may allow a broader search: (sustancias OR instancias) (((academicas. OR academic. ) OR academica. ) OR academicos. )~.
• Adding a wildcard symbol may retrieve word variants: "(sustancias OR instancias) (((academicas." OR academic.") OR academica.") OR academicos.")*.