Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
qua pham » quan pham, quy pham, qua cham
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cua tre » cuu tre, cua triet, dua tren
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: su sach ky nang x hoi. hieu qua pham duc ((van thanh) OR (ban thanh)) va ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu qua pham duc ((van thanh) OR (ban thanh)) va ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu qua pham duc ((van thanh) OR (ban thanh)) va ((cua tre) or (cua te))*.