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)
"publicaaao administration" » "publicaaaao administration" (Expand Search), "publicoaaao administration" (Expand Search), "publicasaaao administration" (Expand Search), "publicaaao administracao" (Expand Search)
"publicoosoa administration" » "publicaoosoa administration" (Expand Search), "publicooosoa administration" (Expand Search), "publicasoosoa administration" (Expand Search), "publicoosoa 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 ("publicaaao administration"))) OR ("publicoosoa administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicaaao administration\"))) OR (\"publicoosoa administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicaaao administration ))) OR ( publicoosoa administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicaaao administration"))) OR ("publicoosoa administration"))*.