Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search)
"publicos administration" » "publicaos administration" (Expand Search), "publicoos administration" (Expand Search), "publicasos administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search), "publica administration" (Expand Search)
"publicoao administracao" » "publicaoao administracao" (Expand Search), "publicooao administracao" (Expand Search), "publicasoao administracao" (Expand Search), "publica administracao" (Expand Search), "publico administracao" (Expand Search), "publicas 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 ("publicos administration"))) OR ("publicoao administracao"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicos administration\"))) OR (\"publicoao administracao\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicos administration ))) OR ( publicoao administracao )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicos administration"))) OR ("publicoao administracao"))*.