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)
"publicooaooa administration" » "publicaooaooa administration" (Expand Search), "publicasooaooa administration" (Expand Search), "publicosooaooa administration" (Expand Search), "publicooaooa administracao" (Expand Search), "publicaoaooa 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 ("publicooaooa administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publico administration\"))) OR (\"publicooaooa administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publico administration ))) OR ( publicooaooa administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publico administration"))) OR ("publicooaooa administration"))*.