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

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 cua ((ban danh) OR (ban doanh)) 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 cua ((ban danh) OR (ban doanh)) 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 cua ((ban danh) OR (ban doanh)) vai ((cua tre) or (so viet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. hieu ve cau cua ((ban danh) OR (ban doanh)) vai ((cua tre) or (so viet))*.