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
de pensamiento » el pensamiento, y 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)) ((de pensamiento) OR (del pensamiento)) politico; ) or ( bibliotecas claves fajardo ((de pensamiento) OR (del pensamiento)) critico; ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( bibliotecas ((gonzalez fajardo) OR (gonzalez guajardo)) ((de pensamiento) OR (del pensamiento)) politico; ) OR ( bibliotecas claves fajardo ((de pensamiento) OR (del pensamiento)) critico; )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( bibliotecas ((gonzalez fajardo) or (gonzalez guajardo)) ((de pensamiento) OR (del pensamiento)) politico; ) or ( bibliotecas claves fajardo ((de pensamiento) OR (del pensamiento)) critico; ))".
• Adding a wildcard symbol may retrieve word variants: (( bibliotecas ((gonzalez fajardo) or (gonzalez guajardo)) ((de pensamiento) OR (del pensamiento)) politico; ) or ( bibliotecas claves fajardo ((de pensamiento) OR (del pensamiento)) critico; ))*.