Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
xuc ban » cuc ban, quoc ban, xuat ban
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
nang o » nang ho, nang ro, nang x
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang o) or (nang co)) hai. hieu ve cac ((xuc ban) OR (duc ban)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang o) OR (nang co)) hai. hieu ve cac ((xuc ban) OR (duc ban)) hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang o) or (nang co)) hai. hieu ve cac ((xuc ban) OR (duc ban)) hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang o) or (nang co)) hai. hieu ve cac ((xuc ban) OR (duc ban)) hanh thai cua tre*.