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)
"publicos administration" » "publicaos administration" (Expand Search), "publicoos administration" (Expand Search), "publicasos administration" (Expand Search), "publicos administracao" (Expand Search), "publico administration" (Expand Search), "publicas administration" (Expand Search), "publica administration" (Expand Search)
"publicaa administration" » "publicaaa administration" (Expand Search), "publicoaa administration" (Expand Search), "publicasaa administration" (Expand Search), "publicaa administracao" (Expand Search), "publica administration" (Expand Search), "publicas administration" (Expand Search), "publico 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 ("publicos administration"))) OR ("publicaa administration"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"public administration\") OR (\"publicos administration\"))) OR (\"publicaa administration\"))".
• Removing quotes may allow a broader search: (((( public administration ) OR ( publicos administration ))) OR ( publicaa administration )).
• Adding a wildcard symbol may retrieve word variants: (((("public administration") OR ("publicos administration"))) OR ("publicaa administration"))*.