Perhaps you should try some spelling variations:
chat thien » phat trien, cai thien, phat hien
cad chat » cao chat, cac chat, van chat
hanh cad » hanh cac, hanh cat, hanh cap
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
ve cao » va cao, ve bao, ve cac
ha hoi » hoa hoi, va hoi, ha hoa

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 ky lang ((((ha hoi) OR (ha noi))) or (xa hoi)). hieu ve cao duc va hanh cad chat thien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang ((((ha hoi) OR (ha noi))) OR (xa hoi)). hieu ve cao duc va hanh cad chat thien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang ((((ha hoi) OR (ha noi))) or (xa hoi)). hieu ve cao duc va hanh cad chat thien".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang ((((ha hoi) OR (ha noi))) or (xa hoi)). hieu ve cao duc va hanh cad chat thien*.