Sao Viet Trading And Investment J.S.C ( Vstar) specializes importing and exporting of fertilizers, including premium fertilizer ex – K+S ( Germany), EU speciality fertilizers, mineral salts, and chemicals produced by K+S ( Germany) for food, animal feed, and industrial usages. Sao Viet Trading And Investment J.S.C ( Vstar) specializes importing and exporting of fertilizers, including premium fertilizer ex – K+S ( Germany), EU speciality fertilizers, mineral salts, and chemicals produced by K+S ( Germany) for food, animal feed, and industrial usages.