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