Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
va thanh » gia thanh, va tinh, le thanh
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
va cao » va cac, va co, va dao
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang ((ma hoi) or (xa hoi)). hieu va cao duc ((va thanh) OR (ban thanh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((ma hoi) OR (xa hoi)). hieu va cao duc ((va thanh) OR (ban thanh)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((ma hoi) or (xa hoi)). hieu va cao duc ((va thanh) OR (ban thanh)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((ma hoi) or (xa hoi)). hieu va cao duc ((va thanh) OR (ban thanh)) vi cua triet*.