I solved it. I still have to polish it, but it is working. I just rewrote most of it instead of using the system of the tutorial I followed.

My code at the moment is:

server {
        ##DM - uncomment following line for domain mapping
        #listen 80 default_server;
        server_name thecrazytravel.com *.thecrazytravel.com ;
        ##DM - uncomment following line for domain mapping
        #server_name_in_redirect off;

        access_log   /var/log/nginx/thecrazytravel.com.access.log;
        error_log    /var/log/nginx/thecrazytravel.com.error.log;

        root /var/www/thecrazytravel;
        index index.php index.html index.htm;
        include hhvm.conf;

# PLUGINS : Enable Rewrite Rules for Yoast SEO SiteMap
rewrite ^/sitemap_index\.xml$ /index.php?sitemap=1 last;
rewrite ^/([^/]+?)-sitemap([0-9]+)?\.xml$ /index.php?sitemap=$1&sitemap_n=$2 last;

# Rewrite rules for WordPress Multi-site.
rewrite ^.*/files/(.*) /wp-includes/ms-files.php?file=$1;
if (!-e $request_filename)
{
rewrite ^.+?/?(/wp-.*) $1 last;
rewrite ^(.+)$ /index.php;
}

        location / {
                try_files $uri $uri/ /index.php?$args ;
        }

        location ~ \.php$ {
                try_files $uri =404;
                include fastcgi_params;
                fastcgi_pass 127.0.0.1:9000;
    # ENABLE : Enable PHP, listen fpm sock
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
    fastcgi_index index.php;
    include fastcgi_params;
        }

        location ~* ^.+\.(js|css|swf|xml|txt|ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|rss|atom|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bmp|rtf)$ {
                access_log off; log_not_found off; expires 30d;
        }

        location = /robots.txt { access_log off; log_not_found off; }
        location ~ /\. { deny  all; access_log off; log_not_found off; }
}

It could be improved, but it is running now. I hope it helps somebody out there with the same problem.