Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search), "public administracao" (Expand Search)
"publicaaaas administration" » "publicaaaaas administration" (Expand Search), "publicoaaaas administration" (Expand Search), "publicasaaaas administration" (Expand Search), "publicaaaas administracao" (Expand Search)
"publicooao administration" » "publicaooao administration" (Expand Search), "publicoooao administration" (Expand Search), "publicasooao administration" (Expand Search), "publicooao administracao" (Expand Search)

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

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