Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
hanh tai » thanh tai, hang tai, han tai
qua cham » qua hai, qua cac, va cham
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
cham lo » cham o, cam lo, cham soc
dai hoi » dai hoc, dai hai, dai moi
tai hoi » tai khoi, tai hai, tai hoe
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
lo va » lo van, lao va, ly va

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) or (thuat sach)) y nang ((tai hoi) OR (dai hoi)). hieu qua cham lo va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) y nang ((tai hoi) OR (dai hoi)). hieu qua cham lo va hanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat sach)) y nang ((tai hoi) OR (dai hoi)). hieu qua cham lo va hanh tai cua tre*".