What should I do for an e-visa extension? I want to stay in Vietnam for an extended period than that allowed by e-visa?
E-visa is to cater to the specific needs of visitors who intend to stay in Vietnam for less than 30 days. You should apply for a visa on arrival if you wish to need permission to stay in Vietnam for more than 30 days.
You have entered into Vietnam on an e-visa already and wanted to extend your stay there. In such case, you should visit the immigration office of Vietnam in the City where you stay and file an extension request.