Perhaps you should try some spelling variations:
vat dung » van dung, viet dung, mat duong
va triet » va thiet, va trien, ve triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu he » hieu ve, hiem he, hieu le
va dung » van dung, va duong, va ung
ma hoi » mai hoi, xa hoi, ma hoa
he nam » ha nam, nghe nam
sai va » mai va, dai va, hai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky sang ma hoi. hieu he nam thu ((va dung) or (vat dung)) sai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky sang ma hoi. hieu he nam thu ((va dung) OR (vat dung)) sai va triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky sang ma hoi. hieu he nam thu ((va dung) or (vat dung)) sai va triet*.