Perhaps you should try some spelling variations:
sobre administrativo » sobre administracion (Expand Search), refere administrativo (Expand Search), social administrativo (Expand Search)
sobre administracao » sobre administracion (Expand Search), sobre administraciones (Expand Search), boa administracao (Expand Search)
1000 preguntas » 1.000 preguntas (Expand Search), 100 preguntas (Expand Search), 111 preguntas (Expand Search)
500 preguntas » 100 preguntas (Expand Search), 1.000 preguntas (Expand Search), las 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) OR (500 preguntas)) sobre administrativo") OR ("((1000 preguntas) OR (500 preguntas)) sobre administracao"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"((1000 preguntas) OR (500 preguntas)) sobre administrativo\") OR (\"((1000 preguntas) OR (500 preguntas)) sobre administracao\"))".
• Removing quotes may allow a broader search: (( ((1000 preguntas) OR (500 preguntas)) sobre administrativo ) OR ( ((1000 preguntas) OR (500 preguntas)) sobre administracao )).
• Adding a wildcard symbol may retrieve word variants: (("((1000 preguntas) OR (500 preguntas)) sobre administrativo") OR ("((1000 preguntas) OR (500 preguntas)) sobre administracao"))*.