Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
nang tai » hang tai, tang tai, sang tai
qua cham » qua hai, qua cac, va cham
van hanh » van thanh, ban hanh, van anh
tai cua » thai cua, tai cuc, tri cua
va hanh » va danh, ban hanh, dao hanh
sach ky » sac ky, sach y, sach ty
cham lo » cham o, cam lo, cham soc
tai hoi » tai khoi, dai hoi, tai hai
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 hoi. hieu qua cham lo ((((va hanh) OR (va thanh))) or (van hanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang tai hoi. hieu qua cham lo ((((va hanh) OR (va thanh))) OR (van hanh)) tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang tai hoi. hieu qua cham lo ((((va hanh) OR (va thanh))) or (van hanh)) tai cua tre*".