Can a tourist visa be converted to a work visa in Vietnam?

A foreign national currently in Vietnam on a tourist visa is inquiring whether their visa can be converted to a work visa to legally remain and work in the country.

Reader David sent the question to VnExpress:

I am a foreign national currently in Vietnam on a tourist visa. I recently found an employment opportunity and would like to extend my stay to work legally.

Is it possible to convert my current tourist visa directly into a work visa without having to leave the country?

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