Perhaps you should try some spelling variations:
"1000 preguntas refere administrativo" » "1000 preguntas deberes administrativos" (Expand Search), "1000 preguntas recurso administrativo" (Expand Search), "1000 preguntas reforma administrativa" (Expand Search), "1.000 preguntas refere administrativo" (Expand Search), "100 preguntas refere administrativo" (Expand Search), "1220 preguntas refere administrativo" (Expand Search)
"1000 Preguntas sobre administracion" » "1000 Preguntas de administracion" (Expand Search), "1000 Preguntas entre administraciones" (Expand Search), "1000 Preguntas espana administracion" (Expand Search), "1000 Preguntas sobrde administracion" (Expand Search), "1000 Preguntas sobry administracion" (Expand Search), "1000 Preguntas sobrla administracion" (Expand Search)
"1000 Preguntas e administracion" » "1000 Preguntas de administracion" (Expand Search), "1000 Preguntas y administracion" (Expand Search), "1000 Preguntas la administracion" (Expand Search)
preguntas e » preguntas de (Expand Search), preguntas en (Expand Search), preguntas y (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 administracion") OR ("1000 Preguntas e administracion"))) OR ("1000 preguntas refere administrativo"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"1000 Preguntas sobre administracion\") OR (\"1000 Preguntas e administracion\"))) OR (\"1000 preguntas refere administrativo\"))".
• Removing quotes may allow a broader search: (((( 1000 Preguntas sobre administracion ) OR ( 1000 Preguntas e administracion ))) OR ( 1000 preguntas refere administrativo )).
• Adding a wildcard symbol may retrieve word variants: (((("1000 Preguntas sobre administracion") OR ("1000 Preguntas e administracion"))) OR ("1000 preguntas refere administrativo"))*.