Perhaps you should try some spelling variations:
dung thuong » dung trong, hang thuong, dung thuoc
thien thanh » tien thanh, thi thanh, hien hanh
cong thuong » hang thuong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
lan thanh » luan thanh, lang thanh, ban thanh
thanh cau » thanh chau, thanh mau, nhanh cau

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