Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sang tai » hang tai, sang tao, tang tai
danh vai » danh sai, danh va, doanh van
la tren » loai tren, dua tren, dat tren
tai hoi » tai khoi, dai hoi, tai hai
y sang » _ sang, duy sang
va cai » va cac, va bai, va dai
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vai la » tai la, vai va
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: thu sach y sang tai hoi. hieu ((va cai) or (ve cac)) ((xuc va) OR (luc va)) danh vai la tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y sang tai hoi. hieu ((va cai) OR (ve cac)) ((xuc va) OR (luc va)) danh vai la tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y sang tai hoi. hieu ((va cai) or (ve cac)) ((xuc va) OR (luc va)) danh vai la tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y sang tai hoi. hieu ((va cai) or (ve cac)) ((xuc va) OR (luc va)) danh vai la tren*.