Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
va nang » van nang, da nang, cam nang
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((va nang) or (van dong)) x hoi. hieu van cam tuc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((va nang) OR (van dong)) x hoi. hieu van cam tuc va hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: so sach ((va nang) or (van dong)) x hoi. hieu van cam tuc va hanh vi cua vat*.