Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
su sach » so sach, vu sach
tang xa » trang xa, tang ma, lang xa
tuc van » thuc van, truc van, tuc va
hanh va » hang va, hanh vi
sach 7 » sach y, sach 2
7 tang » 6 tang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
va cau » van cau, va cac, va dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach 7 tang xa hoi. hieu ((ve cam) or (ve cac)) tuc van hanh va cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 7 tang xa hoi. hieu ((ve cam) OR (ve cac)) tuc van hanh va cau treo.
• Adding a wildcard symbol may retrieve word variants: su sach 7 tang xa hoi. hieu ((ve cam) or (ve cac)) tuc van hanh va cau treo*.