Perhaps you should try some spelling variations:
ban hanh » ban hang
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
vu cham » va cham, vu kham, tu cham
lam cuu » lam chu, lam cua, cham cuu
va hanh » van hanh, va thanh, va danh
hieu vu » hieu va, hieu ve, hieu su
ty tang » tay tang, ty hang, ky tang
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty tang) or (ty xang)) ma hoi. hieu vu cham duc ((va hanh) or (ban hanh)) lam cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty tang) OR (ty xang)) ma hoi. hieu vu cham duc ((va hanh) OR (ban hanh)) lam cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty tang) or (ty xang)) ma hoi. hieu vu cham duc ((va hanh) or (ban hanh)) lam cuu tre*.