Perhaps you should try some spelling variations:
tien thanh » tien thinh, tran thanh, den thanh
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, nhung don
tranh cua » doanh cua, manh cua
hang cong » dang cong, hang nong, bang cong
hoc tien » hoc tieng, hoc hien, hoc vien
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tien thanh - hanh tranh cua ((nhung cong) or (hang cong)) tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien thanh - hanh tranh cua ((nhung cong) OR (hang cong)) tap toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc tien thanh - hanh tranh cua ((nhung cong) or (hang cong)) tap toan cau*.