There are three ways to get a Vietnamese visa:

Option 1: Apply visa at Vietnamese Embassy/ Consulate: https://vietnamvisaembassy.org/embassy/

Option 2: Apply Vietnam visa on arrival online: https://vietnamvisaembassy.org/apply-visa/

Option 3: Apply Vietnam E-Visa online: https://evisa.xuatnhapcanh.gov.vn/trang-chu-ttdt