Perhaps you should try some spelling variations:
bibliotecas claves » bibliotecas anales, bibliotecas escolares, bibliotecas rurales
gonzalez guajardo » gonzalez guijarro, gonzalez gerardo, gonzalez bayardo
gonzalez fajardo » gonzalez bayardo, gonzalez eduardo, gonzalez faraco
y pensamiento » el pensamiento
critico; » critica;

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( bibliotecas ((gonzalez fajardo) or (gonzalez guajardo)) ((y pensamiento) or (del pensamiento)) politico; ) or ( bibliotecas claves fajardo ((y pensamiento) or (del pensamiento)) critico; ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( bibliotecas ((gonzalez fajardo) OR (gonzalez guajardo)) ((y pensamiento) OR (del pensamiento)) politico; ) OR ( bibliotecas claves fajardo ((y pensamiento) OR (del pensamiento)) critico; )).
• Adding a wildcard symbol may retrieve word variants: (( bibliotecas ((gonzalez fajardo) or (gonzalez guajardo)) ((y pensamiento) or (del pensamiento)) politico; ) or ( bibliotecas claves fajardo ((y pensamiento) or (del pensamiento)) critico; ))*.