Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang tai » hang tai, tang tai, nang cao
sang tai » hang tai, sang tao, tang tai
qua cham » qua hai, qua cac, va cham
va hanh » van hanh, va thanh, ban hanh
tai cua » thai cua, tai cuc, tri cua
va danh » va dinh, va dan, dia danh
cham lo » cham o, cam lo, cham soc
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet

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