Can you apply for a second Vietnam visa while the first one is still valid, and what entry point should you list?

The specific entry point is not critical: the visa is valid for entry to Vietnam, so you can arrive through a different airport or border crossing.

One option is to just spend a week in a neighboring country while the second visa is being processed, avoiding the guesswork about the entry point.

You can apply for a second visa while still on the first one, but there's a risk it gets sent back for revision. For a faster and more reliable process, it's better to use a visa agency.

When applying for a second visa from abroad in advance, it's hard to know the exact entry point since the actual visa run location isn't known yet.