Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
ban hanh » ban hang
tuc ban » thuc ban, truc ban, tu ban
tu sach » thu sach, su sach, te sach
may hoi » may thoi, tay hoi, mai hoi
sach 7 » sach y, sach 2
ve cac » va cac, vien cac
ve cai » va cai, ve tai, ve cau
vi cau » va cau, ve cau, di cau
va dai » va dao, vi dai, va dau
mang » nang, dang, bang

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 7 mang may hoi. hieu ((((ve cai) OR (va dai))) OR (ve cac)) tuc ban hanh vi cau tren~.
• Adding a wildcard symbol may retrieve word variants: tu sach 7 mang may hoi. hieu ((((ve cai) or (va dai))) or (ve cac)) tuc ban hanh vi cau tren*.