Perhaps you should try some spelling variations:
hien thanh » thien thanh, hien hanh, tien thanh
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh cua » doanh cua, manh cua
nhung don » nhung van, nhung bo
hang cong » dang cong, hang nong, bang cong
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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 thanh - hanh tranh cua ((nhung don) or (hang cong)) ((tan toan) OR (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien thanh - hanh tranh cua ((nhung don) OR (hang cong)) ((tan toan) OR (tap toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien thanh - hanh tranh cua ((nhung don) or (hang cong)) ((tan toan) OR (tap toan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien thanh - hanh tranh cua ((nhung don) or (hang cong)) ((tan toan) OR (tap toan)) cau*.