Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search), "public administracao" (Expand Search)
"publicaaos administration" » "publicaaaos administration" (Expand Search), "publicoaaos administration" (Expand Search), "publicasaaos administration" (Expand Search), "publicaaos administracao" (Expand Search), "publicas administration" (Expand Search), "publicos administration" (Expand Search)
"publicooa administration" » "publicaooa administration" (Expand Search), "publicoooa administration" (Expand Search), "publicasooa administration" (Expand Search), "publicooa administracao" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search), "publicos 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 ("publicaaos administration"))) OR ("publicooa administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicaaos administration\"))) OR (\"publicooa administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicaaos administration ))) OR ( publicooa administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicaaos administration"))) OR ("publicooa administration"))*.