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

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. hieu ve cac luc va hanh vu ((va triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ma hoi. hieu ve cac luc va hanh vu ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu ve cac luc va hanh vu ((va triet) OR (ve triet))*.