Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
hanh va » hang va, hanh vi
tang xa » trang xa, tang ma, lang xa
va cai » va cac, va bai, va dai
sach 6 » sach 2
ve cac » va cac, vien cac
va cau » van cau, va cac, va dau

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) OR (sach y)) tang xa hoi. hieu ((va cai) OR (ve cac)) thuc ban hanh va cau treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach 6) OR (sach y)) tang xa hoi. hieu ((va cai) or (ve cac)) thuc ban hanh va cau treo~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach 6) OR (sach y)) tang xa hoi. hieu ((va cai) or (ve cac)) thuc ban hanh va cau treo*.