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

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