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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("biblioteca basica de administracio local") OR ("biblioteca basica dret administratiun publica"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"biblioteca basica de administracio local\") OR (\"biblioteca basica dret administratiun publica\"))".
• Removing quotes may allow a broader search: (( biblioteca basica de administracio local ) OR ( biblioteca basica dret administratiun publica )).
• Adding a wildcard symbol may retrieve word variants: (("biblioteca basica de administracio local") OR ("biblioteca basica dret administratiun publica"))*.