Perhaps you should try some spelling variations:
institutos tecnologias » instituto tecnologico
publicaciones del » publicaciones de, publicaciones peri, publicacion de
del institutos » del instituto, el instituto, e institutos
tecnologias de » tecnologia de
mineral de » general de, mineria de, mineral y
minero de » minera de, mineria de

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: publicaciones del institutos tecnologias de ((minero de) OR (mineral de)) espana ;~.
• Adding a wildcard symbol may retrieve word variants: publicaciones del institutos tecnologias de ((minero de) or (mineral de)) espana ;*.