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