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