Como configurar o nginx para pasta adm tratar como um outro servidor?

[Michel Kuguio 3]

eu ja fiz isso com htaccess mas no nginx não estou conseguindo eu tentei como pode ver no arquivo mas nada

server {
        listen 80 ;
        charset utf-8;
        # Make site accessible from http://localhost/
        server_name   ~^(?<domain>.+)\.dev$;


        root /vagrant/sites/$domain/public;
        index index.html index.htm index.php index.phtml;


        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                # try_files $uri $uri/  =404;
                try_files $uri $uri/ /index.php?$args;
                # Uncomment to enable naxsi on this location
                # include /etc/nginx/naxsi.rules
        }

        # Only for nginx-naxsi used with nginx-naxsi-ui : process denied requests
        #location /RequestDenied {
        #       proxy_pass http://127.0.0.1:8080;
        #}

        error_page 404 /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
                root /vagrant/sites/$domain/public;
        }

        location /admin {
                root /vagrant/sites/$domain/public;
                try_files $uri $uri $domain/index.php?$args $uri/index.php?$args;
        }



        location ~* \.(?:ico|css|js|gif|png|swf|pdf|mov|fla|zip|rar|jpe?g)$ {
                        expires max;
                        add_header Pragma public;
                        add_header Cache-Control "public, must-revalidate, proxy-revalidate";
                        try_files $uri =404;
        }

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        location ~ \.(php|phtml)$ {
                include fastcgi_params;
                fastcgi_split_path_info ^(.+\.php)(/.+)$;
                # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini

                # With php5-cgi alone:
                #fastcgi_pass 127.0.0.1:9000;
                # With php5-fpm:

                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME $request_filename;
                try_files $uri $uri/ /index.php?$args;

        }

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        location ~ /\.ht {
                deny all;
        }

        sendfile off;

        ###############
        # Habilita o gzip
        gzip      on;
        gzip_http_version  1.1;
        gzip_vary    on;
        gzip_comp_level  6;
        gzip_proxied  any;

        # Mime-types que sero compactados
        gzip_types    text/html text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

        # http://blog.leetsoft.com/2007/7/25/nginx-gzip-ssl
        gzip_buffers  16  8k;

        # Desabilita o gzip para alguns navegadores
        gzip_disable  "MSIE [1-6].(?!.*SV1)";
}
server {
        listen 80 ;
        charset utf-8;
        # Make site accessible from http://localhost/
        server_name   ~^(?<domain>.+)\.dev/admin$;


        root /vagrant/sites/$domain/public/admin;
        index index.html index.htm index.php index.phtml;


        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                # try_files $uri $uri/  =404;
                try_files $uri $uri/ /index.php?$args;
                # Uncomment to enable naxsi on this location
                # include /etc/nginx/naxsi.rules
        }

        # Only for nginx-naxsi used with nginx-naxsi-ui : process denied requests
        #location /RequestDenied {
        #       proxy_pass http://127.0.0.1:8080;
        #}

        error_page 404 /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
                root /vagrant/sites/$domain/public/admin;
        }


        location ~* \.(?:ico|css|js|gif|png|swf|pdf|mov|fla|zip|rar|jpe?g)$ {
                        expires max;
                        add_header Pragma public;
                        add_header Cache-Control "public, must-revalidate, proxy-revalidate";
                        try_files $uri =404;
        }

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        location ~ \.(php|phtml)$ {
                include fastcgi_params;
                fastcgi_split_path_info ^(.+\.php)(/.+)$;
                # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini

                # With php5-cgi alone:
                #fastcgi_pass 127.0.0.1:9000;
                # With php5-fpm:

                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME $request_filename;
                try_files $uri $uri/ /index.php?$args;

        }

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        location ~ /\.ht {
                deny all;
        }

        sendfile off;

        ###############
        # Habilita o gzip
        gzip      on;
        gzip_http_version  1.1;
        gzip_vary    on;
        gzip_comp_level  6;
        gzip_proxied  any;

        # Mime-types que sero compactados
        gzip_types    text/html text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;

        # http://blog.leetsoft.com/2007/7/25/nginx-gzip-ssl
        gzip_buffers  16  8k;

        # Desabilita o gzip para alguns navegadores
        gzip_disable  "MSIE [1-6].(?!.*SV1)";
}