Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
so viet » hoc viet
nam tu » nam thu, nam thuc
x hoi » xa hoi, o hoi, x ho

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: vu sach ky nang x hoi. hieu van nam tu ((va hanh) OR (va danh)) ve ((su viet) OR (so viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang x hoi. hieu van nam tu ((va hanh) or (va danh)) ve ((su viet) OR (so viet))~".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang x hoi. hieu van nam tu ((va hanh) or (va danh)) ve ((su viet) OR (so viet))*.