Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
cua tong » cua cong, cua nong, cua song
cua dong » chua dong, cua cong, cua dang
cong san » cong tac
san toan » van toan, dan toan, manh 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 thien hach - thanh cong ((cua tong) or (cua dong)) cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - thanh cong ((cua tong) OR (cua dong)) cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - thanh cong ((cua tong) or (cua dong)) cong san toan cau*.