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