Perhaps you should try some spelling variations:
publicacion de » publicaciones de, aplicacion de
tecnologico de » tecnologica de, tecnologia de, tecnologias de
de instituto » del instituto, el instituto, e institutos
generales en » generales del, generales de, generales y
mineral de » general de, mineria de, mineral y

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

• If you are trying to use Boolean operators, they must be ALL CAPS: publicacion de instituto tecnologico de ((mineral de) OR (generales en)) espana ;~.
• Adding a wildcard symbol may retrieve word variants: publicacion de instituto tecnologico de ((mineral de) or (generales en)) espana ;*.