Perhaps you should try some spelling variations:
instrumento pedagogico » instituto pedagogico, instrumento biologico, instrumento didactico
publicaciones e » publicaciones de, publicaciones en, publicaciones y
e instrumento » e instrumentos, de instrumentos, un instrumento
pedagogico y » pedagogicos y, pedagogica y, pedagogico de
mineral de » general de, mineria de
mineral y » general 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 e instrumento pedagogico y ((mineral de) OR (mineral y)) espana ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "publicaciones e instrumento pedagogico y ((mineral de) OR (mineral y)) espana ;".
• Adding a wildcard symbol may retrieve word variants: publicaciones e instrumento pedagogico y ((mineral de) OR (mineral y)) espana ;*.