Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, dien sach
hien hanh » dieu hanh
bo sach » hoc sach
co sach » cuon sach, hoc sach
ty mang » ty xang, ty hang, tin mang
mang xa » lang xa, mang may, dang xay
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (co sach)) ty mang xa hoi. hieu ((hien bach) OR (hien hanh)) nuoc va danh vi cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) or (co sach)) ty mang xa hoi. hieu ((hien bach) OR (hien hanh)) nuoc va danh vi cua tu~".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (co sach)) ty mang xa hoi. hieu ((hien bach) OR (hien hanh)) nuoc va danh vi cua tu*.