Perhaps you should try some spelling variations:
"biblioteca basica la administracion publica. serie especial" » "biblioteca basica la administracio publica. serie especial" (Expand Search), "biblioteca basica la administracion local. serie especial" (Expand Search), "biblioteca basica i administracio publica. serie especial" (Expand Search)
"biblioteca basica de administracio local. serie especial" » "biblioteca basica de administracion local. serie especial" (Expand Search), "biblioteca basica i administracio local. serie especial" (Expand Search), "biblioteca basica dret administratiu local. serie especial" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("biblioteca basica la administracion publica. serie especial") OR ("biblioteca basica de administracio local. serie especial"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"biblioteca basica la administracion publica. serie especial\") OR (\"biblioteca basica de administracio local. serie especial\"))*".
• Removing quotes may allow a broader search: (( biblioteca basica la administracion publica. serie especial ) OR ( biblioteca basica de administracio local. serie especial ))*.