Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
va thanh » gia thanh, ban thanh, va tinh
cham duc » pham duc, cham soc, pham duy
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
ky lang » ky nang, ky dang, ky tang
bai ky » ban ky, sai ky, bac ky
ha hoi » hoa hoi, xa hoi, va hoi
te bai » te bao, te tai, te ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te bai ky lang ((ha hoi) OR (ha noi)). hieu qua cham duc ((va hanh) OR (va thanh)) tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te bai ky lang ((ha hoi) OR (ha noi)). hieu qua cham duc ((va hanh) or (va thanh)) tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: te bai ky lang ((ha hoi) OR (ha noi)). hieu qua cham duc ((va hanh) or (va thanh)) tai cua tre*.