Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu kem » hieu ky, hieu ve
chieu ke » hieu ky, hieu ve, chinh ke
hanh vu » hanh vi, hanh va, hanh tu
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
so sach » so sanh, bo sach, co sach
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, ma hoa, me hoi
vu va » vu van, tu va, su va

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 y nang ((ma hoi) OR (xa hoi)). ((chieu ke) or (hieu kem)) cau luc va hanh vu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ((ma hoi) OR (xa hoi)). ((chieu ke) OR (hieu kem)) cau luc va hanh vu va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ((ma hoi) OR (xa hoi)). ((chieu ke) or (hieu kem)) cau luc va hanh vu va triet".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((ma hoi) OR (xa hoi)). ((chieu ke) or (hieu kem)) cau luc va hanh vu va triet*.