Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
ban hang » ngan hang
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
lam xuc » cam xuc, lam duoc
van lam » van nam
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky tang ((ma hoi) OR (xa hoi)). hieu van lam xuc ((va hanh) or (ban hang)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky tang ((ma hoi) OR (xa hoi)). hieu van lam xuc ((va hanh) OR (ban hang)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky tang ((ma hoi) OR (xa hoi)). hieu van lam xuc ((va hanh) or (ban hang)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky tang ((ma hoi) OR (xa hoi)). hieu van lam xuc ((va hanh) or (ban hang)) vai cua tre*.