There are 2 options to get your e-visa extended as below:
Do It Yourself :
- Download Form NA5 for visa extension fill, sign then bring it to your embassy or consulate to ask for sponsoring.
- Ask your hotel or host for the Temporary residence declaration.
- Bring all mentioned documents above with your original passport to the Immigration Department of Vietnam to ask for visa extension.
Use a Sponsorship Company :
Find a reliable travel agency offers visa extension and bring your passport + Temporary residence declaration (it cheaper if you have this document), they will take care the rest to get your visa extended. Rush service is available.