Perhaps you should try some spelling variations:
"biblioteca salvador alvaro de pensamiento politico;" » "biblioteca salvador alvaro de pensamiento critico;", "biblioteca calvino alvaro de pensamiento politico;", "biblioteca saavedra alvaro de pensamiento politico;", "biblioteca salvador alvaro el pensamiento politico;", "biblioteca salvador alvaro y pensamiento politico;", "biblioteca salvador alvarez de pensamiento politico;"
"biblioteca salvador alvaro del pensamiento politico;" » "biblioteca salvador alvaro del pensamiento critico;", "biblioteca calvino alvaro del pensamiento politico;", "biblioteca saavedra alvaro del pensamiento politico;", "biblioteca salvador alvarez del pensamiento politico;"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("biblioteca salvador alvaro de pensamiento politico;") OR ("biblioteca salvador alvaro del pensamiento politico;"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"biblioteca salvador alvaro de pensamiento politico;\") OR (\"biblioteca salvador alvaro del pensamiento politico;\"))".
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• Adding a wildcard symbol may retrieve word variants: (("biblioteca salvador alvaro de pensamiento politico;") OR ("biblioteca salvador alvaro del pensamiento politico;"))*.