Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
cham lai » pham lan, cham mat, cham va
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu vu » hieu va, hieu ve, hieu su
lai va » loai va, mai va, dai va
ma hoi » mai hoi, xa hoi, 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 nang ((ma hoi) or (ma hoa)). ((hieu vu) or (hieu van)) cham lai va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((ma hoi) OR (ma hoa)). ((hieu vu) OR (hieu van)) cham lai va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((ma hoi) or (ma hoa)). ((hieu vu) or (hieu van)) cham lai va hanh vai cua tre*.