Vietnamese residential architects like to experiment with new materials, colors, textures, details, shapes, and elements. Most of this experimentation occurs within a modernist design approach. Similar exploration in historicist houses are generally a copying of elements from historical precedents and styles. Vietnamese architects seem to pride themselves on their original ideas, and I rarely see duplication or appropriation of others' ideas.
This experimentation does not seem to be a new phenomenon -- many of these experiments seem to be several years old, judging from fading or peeling paint. This house in District 3 of TP. Hồ Chí Minh is a good example.
Some may consider this to be a failed experiment -- I woudn't agree with that even though the slanted window bears little relationship to anything else in the composition except the paint band. I enjoy seeing these experiments in my walks through HCMC neighborhoods, and continued experimentation is leading to very good modernist houses in Việt Nam by Vietnamese architects.