Perhaps you should try some spelling variations:
hien nganh » vien nganh, hien nhanh, hieu nganh
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
hang nong » thang long, han tong
chan cau » can cau, chinh cau, nhanh cau
phan cau » phan dau, phan cac, phan tu

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 nganh - hanh tranh cua ((nhung cong) OR (hang nong)) dan ((chan cau) OR (phan cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien nganh - hanh tranh cua ((nhung cong) or (hang nong)) dan ((chan cau) OR (phan cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc hien nganh - hanh tranh cua ((nhung cong) or (hang nong)) dan ((chan cau) OR (phan cau))*.