Perhaps you should try some spelling variations:
hien hanh » dieu hanh
hien bach » vien bach, thien hach, dien sach
va dinh » van dinh, va kinh, va tinh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va danh » va dan, va hanh, dia danh
vi cua » vai cua, di cua
co sac » co sach, co cac, cao sach
sac ky » cac ky, sai ky
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 sac ky lang xa hoi. hieu ((hien bach) OR (hien hanh)) nuoc ((va danh) OR (va dinh)) vi cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sac ky lang xa hoi. hieu ((hien bach) or (hien hanh)) nuoc ((va danh) OR (va dinh)) vi cua tu~".
• Adding a wildcard symbol may retrieve word variants: co sac ky lang xa hoi. hieu ((hien bach) or (hien hanh)) nuoc ((va danh) OR (va dinh)) vi cua tu*.