Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu viec » nhieu viec, hieu ve, sieu viet
hanh vai » hanh vi, hanh va, hanh tai
viec cac » vien cac, viec cua, viec lam
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cac hoi » cac thoi, cac khoi, cau hoi
su sach » vu sach
ly hang » ly quang
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, ma hoa, me hoi

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 hang ((ma hoi) OR (xa hoi)). hieu viec cac hoi va hanh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ly hang ((ma hoi) OR (xa hoi)). hieu viec cac hoi va hanh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ly hang ((ma hoi) OR (xa hoi)). hieu viec cac hoi va hanh vai cua triet*.