Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search)
"publicaaaas administracao" » "publicaaaaas administracao" (Expand Search), "publicoaaaas administracao" (Expand Search), "publicasaaaas administracao" (Expand Search)
"publicoaa administration" » "publicaoaa administration" (Expand Search), "publicooaa administration" (Expand Search), "publicasoaa administration" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (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 administracao"))) OR ("publicoaa administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicaaaas administracao\"))) OR (\"publicoaa administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicaaaas administracao ))) OR ( publicoaa administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicaaaas administracao"))) OR ("publicoaa administration"))*.