Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
toc sach » doc sach, thuoc sach, nuoc sach
va thanh » gia thanh, ban thanh, va tinh
cam truc » cau truc, nam truc, lam truoc
mai khoi » mai khoa, tai khoa, cac khoi
hoc sach » hoc sinh, hoc cac, hoc anh
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, v nang

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 (hoc sach)) y nang ((ma hoi) or (mai khoi)). hieu va cam truc va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) y nang ((ma hoi) OR (mai khoi)). hieu va cam truc va thanh dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) y nang ((ma hoi) or (mai khoi)). hieu va cam truc va thanh dai cua tre*".