Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nham thuc » nhan thuc, nam thuc, nham thu
toc sach » hoc sach, doc sach, thuoc sach
kho tang » cao tang
vat hanh » vat thanh, van hanh, va hanh
hanh vai » hanh vi, hanh va, hanh tai
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
vai cua » dai cua, hai cua, lai cua
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thuat sach)) kho tang ma hoi. hieu va nham thuc vat hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuat sach)) kho tang ma hoi. hieu va nham thuc vat hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuat sach)) kho tang ma hoi. hieu va nham thuc vat hanh vai cua tre*.