Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
xang van » dang van, tang van, lang van
nam thuc » nam thuoc, nam thu, nam tu
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe

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: so sach ty xang van hoi. hieu ve ((nam thuc) OR (am thuc)) va ((hanh di) OR (hanh de)) cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty xang van hoi. hieu ve ((nam thuc) or (am thuc)) va ((hanh di) OR (hanh de)) cua viet~".
• Adding a wildcard symbol may retrieve word variants: so sach ty xang van hoi. hieu ve ((nam thuc) or (am thuc)) va ((hanh di) OR (hanh de)) cua viet*.