Perhaps you should try some spelling variations:
"bibliotecarios escolares" » "biblioteca escolar"
"bibliotecarios cuales" » "bibliotecarios ala", "bibliotecarios en", "bibliotecarios con"
"bibliotecas escolar" » "biblioteca escolar"
"bibliotecas escolares" » "biblioteca escolares"
"bibliotecarios que" » "bibliotecaria que", "bibliotecarios de", "bibliotecarios en"
"bibliotecario en" » "bibliotecarios en", "biblioteca en", "bibliotecario para"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("bibliotecas escolar") or ((((("bibliotecarios escolares") or ("bibliotecas escolares"))) or ((((("bibliotecarios cuales") or ("bibliotecarios que"))) or ("bibliotecario en"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("bibliotecas escolar") OR ((((("bibliotecarios escolares") OR ("bibliotecas escolares"))) OR ((((("bibliotecarios cuales") OR ("bibliotecarios que"))) OR ("bibliotecario en")))))).
• Removing quotes may allow a broader search: (( bibliotecas escolar ) or ((((( bibliotecarios escolares ) or ( bibliotecas escolares ))) or ((((( bibliotecarios cuales ) or ( bibliotecarios que ))) or ( bibliotecario en )))))).
• Adding a wildcard symbol may retrieve word variants: (("bibliotecas escolar") or ((((("bibliotecarios escolares") or ("bibliotecas escolares"))) or ((((("bibliotecarios cuales") or ("bibliotecarios que"))) or ("bibliotecario en"))))))*.

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