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)
"publicoa administration" » "publicaoa administration" (Expand Search), "publicooa administration" (Expand Search), "publicasoa administration" (Expand Search), "publicoa administracao" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search), "publicos administration" (Expand Search)
"publicooaa administration" » "publicaooaa administration" (Expand Search), "publicoooaa administration" (Expand Search), "publicasooaa administration" (Expand Search), "publicooaa 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 ("publicoa administration"))) OR ("publicooaa administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicoa administration\"))) OR (\"publicooaa administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicoa administration ))) OR ( publicooaa administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicoa administration"))) OR ("publicooaa administration"))*.