Perhaps you should try some spelling variations:
van nang » van quang, van dong, van dung
vat hanh » vat thanh, van hanh, va hanh
hanh vai » hanh vi, hanh va, hanh tai
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
lai roi » lai hoi, loi roi
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
ve am » va am
thuc » thu

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 ((van nang) OR (van ban)) ((mai hoi) or (lai roi)). hieu ve am thuc vat hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((van nang) OR (van ban)) ((mai hoi) OR (lai roi)). hieu ve am thuc vat hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((van nang) OR (van ban)) ((mai hoi) or (lai roi)). hieu ve am thuc vat hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: so sach ((van nang) OR (van ban)) ((mai hoi) or (lai roi)). hieu ve am thuc vat hanh vai cua viet*.