Perhaps you should try some spelling variations:
dung sai » dung tai, dung va, dung dat
tu sach » thu sach, su sach, tu cach
cua tre » cua te, cuu tre, cua triet
va dung » van dung, va duong, vat dung
hieu le » hieu ve, hieu he, hieu ly
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
le nam » ly nam, he nam, le na
thu va » thuc va, thue va, tu va
cua tu » cua tuc, cua su, cua cu

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) or (te sach)) ky tang ma hoi. hieu le nam thu va dung sai ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang ma hoi. hieu le nam thu va dung sai ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky tang ma hoi. hieu le nam thu va dung sai ((cua tre) or (cua tu))*.