Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
bach van » bach dan, cach van, bach dang
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
sach van » sach han, sach va, cach van
cac thu » cach thuc, cac thoi
vai cua » dai cua, hai cua, lai cua
thu van » thuc van, thuy van, tu van
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
lai roi » lai hoi, loi roi
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: co ((sach van) OR (bach van)) nang ((mai hoi) or (lai roi)). hieu ve cac thu van hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co ((sach van) OR (bach van)) nang ((mai hoi) OR (lai roi)). hieu ve cac thu van hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co ((sach van) OR (bach van)) nang ((mai hoi) or (lai roi)). hieu ve cac thu van hanh vai cua viet".
• Adding a wildcard symbol may retrieve word variants: co ((sach van) OR (bach van)) nang ((mai hoi) or (lai roi)). hieu ve cac thu van hanh vai cua viet*.