Perhaps you should try some spelling variations:
ban thanh » ban hang
hieu vien » hieu hien, hieu viec, thieu nien
ban hanh » ban hang
thu sach » tu sach, thuat sach, thuoc sach
vien dai » hien dai
cau tren » cu tren, dau tren, ca tren
dai duc » dao duc, dai dua, mai duc
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau treo
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang x hoi. hieu vien dai duc ((ban thanh) or (ban hanh)) vai ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu vien dai duc ((ban thanh) OR (ban hanh)) vai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu vien dai duc ((ban thanh) or (ban hanh)) vai ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu vien dai duc ((ban thanh) or (ban hanh)) vai ((cuu tre) OR (cau tren))*.