Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
danh vi » hanh vi, dinh vi, danh di
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
va thai » van thai, va tai, va tham
y nang » ky nang, ly nang, v nang
son va » song va, lon va, son ha
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. lieu va thai ((son va) or (son la)) danh vi ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. lieu va thai ((son va) OR (son la)) danh vi ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ma hoi. lieu va thai ((son va) or (son la)) danh vi ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. lieu va thai ((son va) or (son la)) danh vi ((cua triet) OR (va triet))*.