Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
su viet » so viet
sach 7 » sach y, sach 2
7 tang » 6 tang
me hoi » le hoi
ve cau » ke cau, va cau, ve cac
luc va » duc va, tuc va, loc va
kem » kiem

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 ((me hoi) or (ma hoa)). hieu ve cau luc va hanh kem su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 7 tang ((me hoi) OR (ma hoa)). hieu ve cau luc va hanh kem su viet.
• Adding a wildcard symbol may retrieve word variants: su sach 7 tang ((me hoi) or (ma hoa)). hieu ve cau luc va hanh kem su viet*.