Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, toan doanh
ban danh » ban hanh, ban dan, van danh
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
cua cua » cua chua, ca cua, qua cua
van cua » vang cua, ban cua, dan cua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su viet » so viet
cua te » cua tu

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