Perhaps you should try some spelling variations:
thanh tung » thanh cong
chong cong » cong cong, cuong cong, phong cong
thong cong » trong cong, tong cong, thong thong
hien xanh » hien hanh, hien nhanh, chieu xanh
tung cua » trung cua, tuong cua, dung cua
tac toan » tap toan, tam toan, hach toan
toan ban » van ban

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien xanh - thanh tung cua ((chong cong) OR (thong cong)) tac toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - thanh tung cua ((chong cong) OR (thong cong)) tac toan ban*.