越南采购需求：反光材料、夜光材料、反光加工品、夜光加工品、车贴、安全标志

Hi there, I'm reaching out from Soter Co., Ltd. in Vietnam. We've been trying to connect with Mr. Lau regarding our order of sheeting, but we've hit a wall. Unfortunately, we haven't been able to reach him via Zalo or WeChat either. I would really appreciate it if you could guide me on the best way to contact him or if there's someone else we can speak to about the order. Your help would be invaluable as we're eager to move this forward. Thanks a lot!