Perhaps you should try some spelling variations:
thuc ban » thuoc ban, thuc dan, thu ban
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
tang xa » trang xa, tang ma, lang xa
sach 6 » sach y, sach 2
va cai » va cac, va bai, va dai
ve cac » va cac, vien cac
vi cau » va cau, di cau, viet cau
ve cau » ke cau, va cau, le cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 6 tang xa hoi. hieu ((va cai) OR (ve cac)) thuc ban hanh ((vi cau) OR (ve cau)) treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach 6 tang xa hoi. hieu ((va cai) or (ve cac)) thuc ban hanh ((vi cau) OR (ve cau)) treo~".
• Adding a wildcard symbol may retrieve word variants: tu sach 6 tang xa hoi. hieu ((va cai) or (ve cac)) thuc ban hanh ((vi cau) OR (ve cau)) treo*.