Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, thanh san
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
cau thuc » cau truc, cuu thuc, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
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: "hoc sach ty nang ma hoi. hieu van cau thuc dan ((thanh tai) OR (doanh tai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ty nang ma hoi. hieu van cau thuc dan ((thanh tai) OR (doanh tai)) cua tre*.