?i?u 20. Ph?i h?p ?i?u tra tai n?n lao ??ng ch?t ng??i và tai n?n lao ??ng khác có d?u Hello?u t?i ph?me) In just ten working days following obtaining the Formal letter with the provincial occupational accident investigation Staff, the investigation police agency shall reply in writing if this sort of incident can be an occupational incident or