Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "publicos administration" (Expand Search), "public administracao" (Expand Search)
"publicas administration" » "publicaas administration" (Expand Search), "publicoas administration" (Expand Search), "publicosas administration" (Expand Search), "publicas administracao" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search)
"publicoa administration" » "publicaoa administration" (Expand Search), "publicooa administration" (Expand Search), "publicosoa 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("public administration") OR ((("publicas administration") OR ("publicoa administration"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"public administration\") OR (((\"publicas administration\") OR (\"publicoa administration\"))))*".
• Removing quotes may allow a broader search: (( public administration ) OR ((( publicas administration ) OR ( publicoa administration ))))*.