Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh vai » danh sai, danh va, doanh van
ban danh » ban doanh, ban hanh, ban dan
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
so viet » hoc viet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cau » ke cau, ve cac, le cau
va cau » van cau, va cac, va dau

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 lang xa hoi. hieu ((ve cau) OR (va cau)) cua ban danh vai ((cua tre) or (so viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. hieu ((ve cau) OR (va cau)) cua ban danh vai ((cua tre) OR (so viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky lang xa hoi. hieu ((ve cau) OR (va cau)) cua ban danh vai ((cua tre) or (so viet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. hieu ((ve cau) OR (va cau)) cua ban danh vai ((cua tre) or (so viet))*.