Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
so sach » so sanh, bo sach, co sach
ve cac » va cac, vien cac
vi cau » va cau, ve cau, di cau
ve cam » ve cham, va cam, ve cai

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) OR (6 tang)) xa hoi. hieu ((ve cam) OR (ve cac)) thuc van hanh vi cau treo~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((7 tang) OR (6 tang)) xa hoi. hieu ((ve cam) or (ve cac)) thuc van hanh vi cau treo~".
• Adding a wildcard symbol may retrieve word variants: so sach ((7 tang) OR (6 tang)) xa hoi. hieu ((ve cam) or (ve cac)) thuc van hanh vi cau treo*.