Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ban dan » ban hang, ban hanh, ban quan
ca cua » co cua
ve ca » ve cac, ve cai, ve cau

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 lang xa hoi. hieu ve ca cua ((ban dan) or (ban doanh)) vai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu ve ca cua ((ban dan) OR (ban doanh)) vai ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu ve ca cua ((ban dan) or (ban doanh)) vai ((cua tre) or (su triet))*.