Perhaps you should try some spelling variations:
thanh thuong » thanh huong, thanh chuong, thanh phuong
chieu xanh » chieu sach, chieu sang, chieu tinh
trinh toan » tinh toan, thanh toan, trinh han
hieu lang » chieu sang, hieu quang, nhieu tang
thuc dang » thuoc dang, thuc dan, thuc dung
dang cong » dung cong
toan ban » van ban

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (hieu lang)) - thanh thuong thuc dang cong trinh toan ban~.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (hieu lang)) - thanh thuong thuc dang cong trinh toan ban*.