Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hoc sach » hoc sinh, hoc cac, hoc anh
cam truc » cau truc, nam truc, lam truoc
truc gia » truc giac, tuc gia, thuc giai
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » xa hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y nang ((ma hoi) or (mai hoi)). hieu va cam truc gia thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang ((ma hoi) OR (mai hoi)). hieu va cam truc gia thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach y nang ((ma hoi) or (mai hoi)). hieu va cam truc gia thanh dai cua tre*.