Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
sang tao » hang tai
bo sach » co sach, hoc sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, mang may
ca viet » va viet, co viet, hoa viet
vi ca » vit ca, li ca, va ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky ((sang ma) OR (sang tao)) hoi. ((hieu va) or (hieu van)) am thuc va hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky ((sang ma) OR (sang tao)) hoi. ((hieu va) OR (hieu van)) am thuc va hanh vi ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ky ((sang ma) OR (sang tao)) hoi. ((hieu va) or (hieu van)) am thuc va hanh vi ca viet".
• Adding a wildcard symbol may retrieve word variants: bo sach ky ((sang ma) OR (sang tao)) hoi. ((hieu va) or (hieu van)) am thuc va hanh vi ca viet*.