Perhaps you should try some spelling variations:
chiet tach » chieu sach
trong hach » trong mach, trong cach, trong thanh
trong hanh » trong thanh, trong anh, trong canh
hoc chiet » hoc thiet, hoc nhiet, hoc hien
toan van » tran van, toan ban, tan van
van dung » van dong, xay dung, tin dung
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 chiet tach - tinh toan van dung ((trong hach) or (trong hanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - tinh toan van dung ((trong hach) OR (trong hanh)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - tinh toan van dung ((trong hach) or (trong hanh)) toan cau*.