Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc
vat doan » van doan, van doanh, vay doanh
doan dai » doan hai, toan dai, doan dau
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu cu » hieu cua, hieu ca, hieu su
phap tu » phan tu, pham tu
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. hieu cu ((phap thuc) OR (phap tu)) vat doan dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. hieu cu ((phap thuc) OR (phap tu)) vat doan dai cua tre*.