Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
so sach » so sanh, bo sach, co sach
tang xa » trang xa, tang ma, lang xa
tuc van » thuc van, truc van, tuc va
y tang » ky tang, 6 tang, 7 tang
ve cai » va cai, ve tai, ve cau
ve cac » va cac, vien cac
vi cau » va cau, ve cau, di 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: so sach y tang xa hoi. hieu ((ve cai) OR (ve cac)) tuc van hanh vi cau treo~.
• Adding a wildcard symbol may retrieve word variants: so sach y tang xa hoi. hieu ((ve cai) or (ve cac)) tuc van hanh vi cau treo*.