Perhaps you should try some spelling variations:
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
cuu tre » cua tre, cau tren, cau treo
tang xa » trang xa, tang ma, lang xa
sach 7 » sach 2
ve cac » va cac, vien cac
vi cuu » vi luu, vinh cuu
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: tu ((sach 7) OR (sach y)) tang xa hoi. hieu ((ve cam) OR (ve cac)) thuc ban hanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach 7) OR (sach y)) tang xa hoi. hieu ((ve cam) or (ve cac)) thuc ban hanh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach 7) OR (sach y)) tang xa hoi. hieu ((ve cam) or (ve cac)) thuc ban hanh vi cuu tre*.