Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, cua triet
su sach » so sach, vu sach
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
va hanh » va thanh, va danh, ban hanh
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma 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 y nang ma hoi. hieu ve cac luc ((va hanh) OR (van hanh)) vu ((va triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu ve cac luc ((va hanh) OR (van 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) OR (van 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) OR (van hanh)) vu ((va triet) or (ve triet))*.