Perhaps you should try some spelling variations:
qua nhan » cua nhan, qua nhat, qua phan
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) ma hoi. hieu qua nhan ((luc va) OR (tuc va)) hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (v nang)) ma hoi. hieu qua nhan ((luc va) or (tuc va)) hanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (v nang)) ma hoi. hieu qua nhan ((luc va) or (tuc va)) hanh dai cua tre*.