Perhaps you should try some spelling variations:
ban hanh » ban hang
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
duoc ban » duc ban, quoc ban, buoc ban
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ve bao » te bao, va bao
ve tao » de tao, ve tac, ve tai
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang x hoi. hieu ((ve tao) OR (ve bao)) duoc ban hanh vai ((cua viet) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ((ve tao) OR (ve bao)) duoc ban hanh vai ((cua viet) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((ve tao) OR (ve bao)) duoc ban hanh vai ((cua viet) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((ve tao) OR (ve bao)) duoc ban hanh vai ((cua viet) or (cua te))*.