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)
"publicoss administration" » "publicaoss administration" (Expand Search), "publicooss administration" (Expand Search), "publicasoss administration" (Expand Search), "publicoss administracao" (Expand Search), "publicos administration" (Expand Search), "publico administration" (Expand Search), "publicas administration" (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)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicoss administration\"))) OR (\"publicoa administration\"))~".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicoss administration ))) OR ( publicoa administration ))~.
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicoss administration"))) OR ("publicoa administration"))*.