Searching on dprkportal.kp appears to be broken. Example below:

Digging into the javascript it looks like most of the validation is done in the browser based on a regex

I haven’t tested further but the search can be accessed with the following example:

curl http://dprkportal.kp/include/search_func.php?action=search_site&keyword=kcna.kp&page=1

I assume the search doesn’t ever return results since the string for each URL has a period in it and the search bar automatically removes these when typed or copied in.