Perhaps you should try some spelling variations:
su sach » so sach, vu sach
va hanh » van hanh, va thanh, ban hanh
cao hoi » cau hoi, cao hoc, tao hoi
via cua » gia cua, gian cua, giau cua
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, dia danh
sach ky » sac ky, sach y, sach ty
bao bo » bac bo, ban bo, nao bo
va bao » va bai
co hoi » co hoc, co loi
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: su sach ky nang ((cao hoi) or (co hoi)). hieu va bao bo ((va hanh) OR (va danh)) via cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((cao hoi) OR (co hoi)). hieu va bao bo ((va hanh) OR (va danh)) via cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((cao hoi) or (co hoi)). hieu va bao bo ((va hanh) OR (va danh)) via cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((cao hoi) or (co hoi)). hieu va bao bo ((va hanh) OR (va danh)) via cua te*.