Query about Vietnam visa exemption

Dear sirs,

 I have a question, if I have just left Vietnam after an exemption period, 15 days for the UK, do I have to wait 30 days till I can enter  Vietnam using a Visa on Arrival? Or does that only apply to another exemption period?

 Thank you for your help.

Hello,
Thank you for contacting us.

Yes, it is required 30 days from the last day you left Vietnam to use an  another exempted visa. However, if you wish to use the visa on arrival,  you can apply for the approval letter whenever you want. There should be no problem.

Please let us know if we can be of any further assistance.