Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
thanh tung » thanh cong
hien xanh » hien hanh, chieu xanh, hien khanh
tung giao » dung giao, tong giao, cung giao
tong cong » cong cong, dung cong, dang cong
van phong » van dong, hai phong
phong cau » thong cau, phong cac, phong cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) or (hien nhanh)) - thanh tung giao ((tong cong) OR (trong cong)) van phong cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - thanh tung giao ((tong cong) OR (trong cong)) van phong cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien nhanh)) - thanh tung giao ((tong cong) OR (trong cong)) van phong cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - thanh tung giao ((tong cong) OR (trong cong)) van phong cau*.