Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach van » sach han, sach va, bach van
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
van nang » van quang, van ban, van dong
lai roi » lai hoi, loi roi
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
lai cua » dai cua, hai cua, lai chau
bo sach » co sach, hoc sach
ve cam » ve cham, ve cac, va cam

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 van nang ((mai hoi) or (lai roi)). hieu ve cam thuc van hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach van nang ((mai hoi) OR (lai roi)). hieu ve cam thuc van hanh lai cua viet.
• Adding a wildcard symbol may retrieve word variants: bo sach van nang ((mai hoi) or (lai roi)). hieu ve cam thuc van hanh lai cua viet*.