Perhaps you should try some spelling variations:
gobierno electronico » comercio electronico (Expand Search)
modelos oficiales » modelos sociales (Expand Search), modelos espaciales (Expand Search), los oficiales (Expand Search)
apropiacion del » aprobacion del (Expand Search), aprobacion de (Expand Search), apreciacion de (Expand Search)
modelo oficial » modelo policial (Expand Search), modelo judicial (Expand Search), modelo social (Expand Search)
de apropiacion » de expropiacion (Expand Search), de apreciacion (Expand Search), la apropiacion (Expand Search)
del gobierno » de gobierno (Expand Search)

Try widening your search to All Fields.

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

• Removing quotes may allow a broader search: ((modelo oficial) OR (modelos oficiales)) de apropiacion del gobierno electronico.