Opencart Nginx rewrite rule for seo url

opencart có 2 loại route là route cho home/account và route cho seo, tương ứng với hai route sau:

index.php?route=$1
index.php?_route_=$1

# You may add here your
# server {
#       ...
# }
# statements for each of your virtual hosts to this file

##
# You should look at the following URL's in order to grasp a solid understanding
# of Nginx configuration files in order to fully unleash the power of Nginx.
# http://wiki.nginx.org/Pitfalls
# http://wiki.nginx.org/QuickStart
# http://wiki.nginx.org/Configuration
#
# Generally, you will want to move this file somewhere, and start with a clean
# file but keep this around for reference. Or just disable in sites-enabled.
#
# Please see /usr/share/doc/nginx-doc/examples/ for more detailed examples.
##

server {
        listen 80 default_server;
        #listen [::]:80 default_server ipv6only=on;

        root /home/severus/opencart;
        index index.php index.html index.htm;

        # Make site accessible from http://localhost/
        server_name localhost;

        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 404.
                try_files $uri $uri/ /index.php; #$is_args$args;
                # Uncomment to enable naxsi on this location
                #include /etc/nginx/naxsi.rules;
               
                location  /account {
                if (!-e $request_filename) {
                  rewrite ^/account/(.*)$ /index.php?route=account/$1;
                }
                }

                location  /checkout {
                if (!-e $request_filename) {
                  rewrite ^/checkout/(.*)$ /index.php?route=checkout/$1;
                }
                }

                location  /information {
                if (!-e $request_filename) {
                  rewrite ^/information/(.*)$ /index.php?route=information/$1;
                }
                }

                location  /product/special {
                if (!-e $request_filename) {
                  rewrite ^/product/special /index.php?route=product/special;
                }
                }

                location  /product/manufacturer {
                if (!-e $request_filename) {
                  rewrite ^/product/manufacturer /index.php?route=product/manufacturer;
                }
                }


                location /common/home {
                 rewrite ^ http://domain.com;
                }

                if (!-e $request_filename) {
                  rewrite ^/(.*)$ /index.php?_route_=$1;
                } 
        }

        # 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 403 404 500 502 503 504 /50x.html;
        location = /50x.html {
                root /usr/share/nginx/html;
        }

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        location ~ (config\.php|php\.ini) {
                return 444;
        }

        location ~ \.php$ {
                fastcgi_split_path_info ^(.+\.php)(/.+)$;
        #       # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
        #
        #       # With php5-cgi alone:
                fastcgi_pass 127.0.0.1:9001;
        #       # With php5-fpm:
        #       fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
                include fastcgi_params;
        }

#
#server {
#       listen 8000;
#       listen somename:8080;
#       server_name somename alias another.alias;
#       root html;
#       index index.html index.htm;
#
#       location / {
#               try_files $uri $uri/ =404;
#       }
#}


# HTTPS server
#
#server {
#       listen 443;
#       server_name localhost;
#
#       root html;
#       index index.html index.htm;
#
#       ssl on;
#       ssl_certificate cert.pem;
#       ssl_certificate_key cert.key;
#
#       ssl_session_timeout 5m;
#
#       ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
#       ssl_ciphers "HIGH:!aNULL:!MD5 or HIGH:!aNULL:!MD5:!3DES";
#       ssl_prefer_server_ciphers on;
#
#       location / {
#               try_files $uri $uri/ =404;
#       }
#}