Perhaps you should try some spelling variations:
instrumento biologico » instrumento pedagogico, instrumento didactico
instrumento politico » testamento politico
publicacion de » publicaciones de, aplicacion de
de generales » de minerales, de general, y generales
generales de » general de, general del

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

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