Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cua triet » cua viet, su triet
hanh vai » hanh vi, hanh va, hanh tai
vien cac » vien bach, vien dai, vien da
va triet » va thiet, va trien, ve triet
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
cac hoi » cac thoi, cac khoi, cau hoi
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
su sach » vu sach
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

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