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)
"publicooso administration" » "publicaooso administration" (Expand Search), "publicoooso administration" (Expand Search), "publicasooso administration" (Expand Search), "publicooso administracao" (Expand Search), "publicos administration" (Expand Search)
"publicoaaa administration" » "publicaoaaa administration" (Expand Search), "publicooaaa administration" (Expand Search), "publicasoaaa administration" (Expand Search), "publicoaaa 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 ("publicooso administration"))) OR ("publicoaaa administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicooso administration\"))) OR (\"publicoaaa administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicooso administration ))) OR ( publicoaaa administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicooso administration"))) OR ("publicoaaa administration"))*.