Perhaps you should try some spelling variations:
hanh doi » thanh doi, hanh noi, hang doi
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
qua cac » cua cac
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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