Are all patents in Vietnam examined by a government authority after filing?

If not, what types of patents are not examined or what are the requirements to request examination?

Not all applications for patent of invention examined by a government authority (National Office of Intellectual Property) after filing. In order to be examined, a request for examination as to substance must be filed. The request shall be filed within 42 months counted from earliest priority date.

There is no need to file a request of examination as to substance for Design applications.

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