Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » vu sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cac tuc » cac toc, cac tu, cac tac
van cac » van hac, van cau, van bac
so sach » so sanh, bo sach, co sach
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang
vi cua » di cua
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: ((su sach) OR (so sach)) y nang x hoi. hieu van cac tuc va danh ((vi cua) OR (vai cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang x hoi. hieu van cac tuc va danh ((vi cua) OR (vai cua)) te~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang x hoi. hieu van cac tuc va danh ((vi cua) OR (vai cua)) te*.