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