Cognitive Space at the Level of Sentence in Vietnamese: According to Gilles Fauconnier, for any language expression, it always evokes a cognitive space in the consciousness of the perceptor. That space can also be considered as a space simulator of the real space, created in the minds of language users. It is a large holistic perspective which can have many levels, many layers. Every cognitive space contains its components and this space is created from the cognitive frames and cognitive patterns that the language expression reflects. It is made dependent on many factors such as the ability to schematize, the background knowledge, the analytical, synthetic, mapping methods, the concept partitioning, etc. of the perceptor. In this article we use the theory of cognitive space by Gilles Fauconnier to examine the types of cognitive space formed at the level of sentence in Vietnamese. The research results help us better understand how the Vietnamese generate language. Simultaneously, it also enables us to add a good orientation for teaching Vietnamese as a foreign language to foreigners.