Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
hanh sinh » hanh tinh, hanh dinh, hinh sinh
manh toan » thanh toan, anh tuan, tinh toan
van dung » van dong, xay dung, tin dung
san toan » van toan, dan toan, xuan toan
va dung » va duong, vat dung, va ung

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 - hanh sinh ((va dung) OR (van dung)) cong ((san toan) or (manh toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh sinh ((va dung) OR (van dung)) cong ((san toan) OR (manh toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - hanh sinh ((va dung) OR (van dung)) cong ((san toan) or (manh toan)) tap".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh sinh ((va dung) OR (van dung)) cong ((san toan) or (manh toan)) tap*.