In German language, especially in written texts, noun phrases are commonly used with structures that can be expanded by attributes. Therefore, it is very important to understand the structure of noun phrases and how to put them in different positions. To have knowledge and language competence to be able to comprehend the semantic content of these structures, it is necessary to know the word for quantity has similarities in the two languages
nominal phrases in German always belong to one of four cases: Nominativphase, Genitivphrase, Dativphrase, Akkusativphrase. German noun phrases have internal structure represent the grammatical morphology of the noun phrases, its grammatical forms also affect the content of the extended noun phrase. The study focuses on analyzing specifically the structure of extended noun phrases in German compared with Vietnamese in order to find similarities and differences between the two languages, helping Vietnamese learners of German language have more knowledge of two languages, understand and use German more effectively.