Perhaps you should try some spelling variations:
"1000 Preguntas sobre administraciones" » "1000 Preguntas sobre administracion" (Expand Search), "1000 Preguntas entre administraciones" (Expand Search), "1000 Preguntas por administraciones" (Expand Search)
"1000 Preguntas sobre administracao" » "1000 Preguntas sobre administracion" (Expand Search), "1000 Preguntas sobre administrativo" (Expand Search), "1000 Preguntas boa administracao" (Expand Search)
1000 preguntas » 1.000 preguntas (Expand Search), 100 preguntas (Expand Search), 500 preguntas (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("1000 Preguntas sobre administracao") OR ("1000 Preguntas sobre administraciones"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"1000 Preguntas sobre administracao\") OR (\"1000 Preguntas sobre administraciones\"))".
• Removing quotes may allow a broader search: (( 1000 Preguntas sobre administracao ) OR ( 1000 Preguntas sobre administraciones )).
• Adding a wildcard symbol may retrieve word variants: (("1000 Preguntas sobre administracao") OR ("1000 Preguntas sobre administraciones"))*.