Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
dung phong » dung phuong, duong phong, rung phong
hieu manh » chieu xanh, dieu hanh, hien hanh
tranh cua » doanh cua, manh cua
phong van » phung van, thong van, phong va
van thanh » ban thanh, van tuan
thanh cau » thanh chau, thanh mau, nhanh cau
cua dung » cua dang, cua dong, qua dung

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 ((((hieu manh) OR (hieu nganh))) OR (thi thanh)) - canh tranh cua dung phong van thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((hieu manh) OR (hieu nganh))) or (thi thanh)) - canh tranh cua dung phong van thanh cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu manh) OR (hieu nganh))) or (thi thanh)) - canh tranh cua dung phong van thanh cau*.