Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
thuc gia » thuc giai, thue gia, thuc dia
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
hiem he » hiem xe, thien he, hiem cho
hieu he » hieu ve, hieu le, hieu hien
mai hoi » mai khoi, dai hoi, lai hoi
lai roi » lai hoi, loi roi
vai hoa » van hoa, va hoa, dai hoa

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