There are still a couple of things in here that are a little confusing, it may be just the just the translation?, will seek further advice and confirm or correct later.
Vietnam: Visas and work permits for expatriates in Vietnam 2015
Last Updated: 15 September 2015
by Russin & Vecchi's lawyers
The content of this article is intended to provide a general guide to the subject matter. Specialist advice should be sought about your specific circumstances.
source: http://www.mondaq.com/x/337212/work+vis … in+Vietnam