WorkVenture gives you an inside look at what it's like to work at YONTSIAM (1977) Co., Ltd., office & team photos, reviews and more. This is the YONTSIAM (1977) Co., Ltd. Company Page. All content is posted anonymously by employees currently or previously working at YONTSIAM (1977) Co., Ltd..Apply to ChodthanawatApply to AP ThailandApply to MichelinApply to WorkVenture Technologies