Perhaps you should try some spelling variations:
manuales administrativos » actos administrativos
areas administrativa » areas administrativas, area administrativa, carrera administrativa
areas economica » crisis economica, zonas economicas
area economico » areas economicas, marco economico, orden economico
area economica » areas economicas, zona economica, la economica
dfe derechos » de derechos, dba derechos, duo derechos
fe derecho » de derecho, del 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: ((manuales administrativos) or (areas administrativa)) ((area economico) or (((area economica) OR (areas economica)))) ((fe derecho) or (dfe derechos))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((manuales administrativos) OR (areas administrativa)) ((area economico) OR (((area economica) OR (areas economica)))) ((fe derecho) OR (dfe derechos)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((manuales administrativos) or (areas administrativa)) ((area economico) or (((area economica) OR (areas economica)))) ((fe derecho) or (dfe derechos))".
• Adding a wildcard symbol may retrieve word variants: ((manuales administrativos) or (areas administrativa)) ((area economico) or (((area economica) OR (areas economica)))) ((fe derecho) or (dfe derechos))*.