Perhaps you should try some spelling variations:
cua triet » su triet, va triet
vat dung » van dung, va dung, viet dung
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu he » hieu ve, hiem he, hieu le
ma hoi » mai hoi, xa hoi, ma hoa
he nam » ha nam, nghe nam

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

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