Perhaps you should try some spelling variations:
ban nhanh » ban thanh, ban nhan, nhan nhanh
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
su sach » vu sach
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
ca tren » cau tren, cu tren, la tren
ve cao » va cao, ve bao, ve cac
li ca » ly ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (su sach)) ky nang x ho. hieu ve cao duc ((ban nhanh) OR (ban hanh)) li ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (su sach)) ky nang x ho. hieu ve cao duc ((ban nhanh) OR (ban hanh)) li ca tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (su sach)) ky nang x ho. hieu ve cao duc ((ban nhanh) OR (ban hanh)) li ca tren".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (su sach)) ky nang x ho. hieu ve cao duc ((ban nhanh) OR (ban hanh)) li ca tren*.