The article presents the research results of textual criticism on the "Tuong" scripts of Quan phuong tap khanh (The whole people wish the Emperor a long life). This is one of the three famous traditional theatre operas under the Nguyen Dynasty handed down to consist of hundreds of acts and performed continuously in hundreds of nights, but now there are only six texts of the first 5 acts left. These archives are very complex with regard to the text as seen from the preserved texts and their steps, signs of the date of texts, works and authors. From the study of the remaining texts, the author suggests that the classic drama of Quan phuong tap khanh might be compiled under the reign of Emperor Tu Duc (1848-1883) by his court officials among them the eminent "Tuong" composer Dao Tan is likely to participate in compiling or editing (some acts). The date of the remaining texts can be a bit later, possibly recopied around the time of Thanh Thai's reign (1889-1907) or later.