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

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