Perhaps you should try some spelling variations:
qua nhan » cua nhan, qua nhat, qua phan
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
luc va » duc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu qua nhan ((luc va) OR (tuc va)) hanh doi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ma hoi. hieu qua nhan ((luc va) OR (tuc va)) hanh doi ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu qua nhan ((luc va) OR (tuc va)) hanh doi ((cua tre) or (cua te))*.