Perhaps you should try some spelling variations:
hien bach » vien bach, thien hach, dien sach
hien hanh » dieu hanh
co sach » bo sach, cuon sach, hoc sach
sach ty » sach y, sach tu, sach thu
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 cu » cua chu, cua cau, cua su

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ty mang xa hoi. hieu ((hien bach) OR (hien hanh)) nuoc va danh vi cua cu~".
• Adding a wildcard symbol may retrieve word variants: co sach ty mang xa hoi. hieu ((hien bach) OR (hien hanh)) nuoc va danh vi cua cu*.