Perhaps you should try some spelling variations:
ban danh » ban doanh, ban hanh, ban dan
danh vai » danh sai, danh va, doanh van
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
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 danh 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 danh 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 danh vai ((cua tre) or (su triet))*.