Perhaps you should try some spelling variations:
instrumento pedagogico » instituto pedagogico, instrumento biologico, instrumento didactico
publicaciones del » publicaciones de, publicaciones peri, publicacion de
del instrumento » de instrumento, de instrumentos, e instrumento
pedagogico de » pedagogia de
mineral de » general de, mineral y

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

• Performing a fuzzy search may retrieve terms with similar spellings: publicaciones del instrumento pedagogico de ((mineral de) or (mineria de)) espana ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: publicaciones del instrumento pedagogico de ((mineral de) OR (mineria de)) espana ;.
• Adding a wildcard symbol may retrieve word variants: publicaciones del instrumento pedagogico de ((mineral de) or (mineria de)) espana ;*.