Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
so sach » so sanh, bo sach, co sach
va nang » van nang, da nang, cam nang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc va
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) OR (hieu va)) cam xuc 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) OR (hieu va)) cam xuc va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((va nang) or (van dong)) x hoi. ((hieu van) OR (hieu va)) cam xuc va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: so sach ((va nang) or (van dong)) x hoi. ((hieu van) OR (hieu va)) cam xuc va hanh vi cua vat*.