Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cau treo » cau theo, cau tren, cau trieu
van hanh » van thanh, ban hanh, van anh
tuc van » thuc van, truc van, tuc va
so sach » so sanh, bo sach, co sach
tang xa » trang xa, tang ma, lang xa
sach 7 » sach y, sach 2
ve cai » va cai, ve tai, ve cau
7 tang » 6 tang
ve cac » va cac, vien cac

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 7 tang xa hoi. hieu ((ve cai) OR (ve cac)) tuc van hanh vi ((cau treo) OR (cau triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach 7 tang xa hoi. hieu ((ve cai) or (ve cac)) tuc van hanh vi ((cau treo) OR (cau triet))~".
• Adding a wildcard symbol may retrieve word variants: so sach 7 tang xa hoi. hieu ((ve cai) or (ve cac)) tuc van hanh vi ((cau treo) OR (cau triet))*.