Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search)
"publicoss administration" » "publicaoss administration" (Expand Search), "publicooss administration" (Expand Search), "publicasoss administration" (Expand Search), "publicos administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search)
"publicoa administracao" » "publicaoa administracao" (Expand Search), "publicooa administracao" (Expand Search), "publicasoa administracao" (Expand Search), "publica administracao" (Expand Search), "publico administracao" (Expand Search), "publicos 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 ("publicoss administration"))) OR ("publicoa administracao"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicoss administration\"))) OR (\"publicoa administracao\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicoss administration ))) OR ( publicoa administracao )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicoss administration"))) OR ("publicoa administracao"))*.