Dear Karl Netscher,
Thanks for concerning with our website!
For visa on arrival, it's important to put your entry date in the application form. In case you do not have exact arrival date, you can fill your approximate date and you can arrive in Viet Nam after that day
For more information, feel free to contact us at firstname.lastname@example.org or call us at (+84) 909 343 525
Helen Truong (Ms.)