Engineers? we welcome the skilled labors and were licensed by the authorities.
However, unfortunately, the majority of Chinese labors came to Vietnam to do the simplest jobs in construction sites, and they work illegally with a tourist visa (they took advantage of the provisions of Vietnam allowing a tourist visa 3 months for Chinese traveler. After 3 months working in Vietnam, illegal Chinese labors go to Cambodia or come back China a few days, then they continue to back to work illegally in Vietnam with a new tourist visa)
A question is: Why dont they stay in richer China to work instead of flooding in Vietnam?
Images of Chinese labores in Vietnam on Vietnamese newspapers: