Perhaps you should try some spelling variations:
"public administration" » "publica administration" (Expand Search), "publico administration" (Expand Search), "public administracao" (Expand Search)
"publicas administration" » "publicaas administration" (Expand Search), "publicoas administration" (Expand Search), "publicas administracao" (Expand Search), "publica administration" (Expand Search), "publico administration" (Expand Search)
"publicos administration" » "publicaos administration" (Expand Search), "publicoos administration" (Expand Search), "publicos administracao" (Expand Search), "publico administration" (Expand Search), "publica 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 ("publicos administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicas administration\"))) OR (\"publicos administration\"))*".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicas administration ))) OR ( publicos administration ))*.