Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hien bach » vien bach, hien hanh, dien sach
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, dang xay
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: co sach ky ((mang xa) OR (nang x)) hoi. hieu ((hien bach) OR (thien hach)) nuoc va danh vi cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky ((mang xa) or (nang x)) hoi. hieu ((hien bach) OR (thien hach)) nuoc va danh vi cua tu~".
• Adding a wildcard symbol may retrieve word variants: co sach ky ((mang xa) or (nang x)) hoi. hieu ((hien bach) OR (thien hach)) nuoc va danh vi cua tu*.