Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
luan phong » luan phuong, xuan phuong, van phong
hien xanh » hien hanh, chieu xanh, hien khanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cao » toan ban, toan tap

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: hoc ((hien xanh) OR (hien nhanh)) - hanh tang luan phong ((cong tan) OR (cong san)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien nhanh)) - hanh tang luan phong ((cong tan) OR (cong san)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - hanh tang luan phong ((cong tan) OR (cong san)) toan cao*.