Perhaps you should try some spelling variations:
generales administrativos » manuales administrativos, controles administrativos, general administration
centrales administrativas » controles administrativos, contratos administrativos, centros administrativos
general administrative » general administracion, control administrativo, centro administrativo
1.3 economia » 1 economia, 333 economia, 7.2 economia
331 economia » 330 economia, la economia, de economia
23 economia » 330 economia, 332 economia, 333 economia
2 economia » y economia, 4 economia, 1 economia
en derecho » al derecho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((generales administrativos) or (centrales administrativas))) or (general administrative)) ((((((23 economia) OR (1.3 economia))) or (331 economia))) or (2 economia)) en derecho~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((generales administrativos) OR (centrales administrativas))) OR (general administrative)) ((((((23 economia) OR (1.3 economia))) OR (331 economia))) OR (2 economia)) en derecho.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((generales administrativos) or (centrales administrativas))) or (general administrative)) ((((((23 economia) OR (1.3 economia))) or (331 economia))) or (2 economia)) en derecho".
• Adding a wildcard symbol may retrieve word variants: ((((generales administrativos) or (centrales administrativas))) or (general administrative)) ((((((23 economia) OR (1.3 economia))) or (331 economia))) or (2 economia)) en derecho*.