Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publicos administration" (Expand Search)
"publicas administracao" » "publicaas administracao" (Expand Search), "publicosas administracao" (Expand Search), "publica administracao" (Expand Search)
"publico administration" » "publicao administration" (Expand Search), "publicoso administration" (Expand Search), "publica administration" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicas administracao\"))) OR (\"publico administration\"))~".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicas administracao ))) OR ( publico administration ))~.
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicas administracao"))) OR ("publico administration"))*.