VISA C: is a short-term visa, usually for a maximum of 90 days, and cannot be extended in Hungary (when the visa expires, you must return to Vietnam to apply for a new visa). Visa C is usually issued for the purposes of visiting relatives, traveling, negotiating trade, etc.
* People with visa C cannot apply for a long-term residence card in Hungary.
VISA D: is a long-term visa, you can apply for a residence card in Hungary, the duration can be up to 2 - 5 years, and can be extended in Hungary without having to return to Vietnam. Usually issued for the purposes of long-term labor, investment, family reunion, study, research, medical treatment, etc.
* Vietnamese workers will be issued visa D.