Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cay mang » cach mang, cay mac, cay cong
va thuat » ky thuat, ki thuat, va thuc
va chat » van chat, va phat, cao chat
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
so sach » so sanh, bo sach, co sach
may hoi » may thoi, tay hoi, mai hoi
soc va » hoc va, loc va, doc va
vi cua » vai cua, di cua

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: so sach ((y mang) OR (cay mang)) may hoi. lieu ((va thuat) OR (va chat)) soc va danh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y mang) OR (cay mang)) may hoi. lieu ((va thuat) or (va chat)) soc va danh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: so sach ((y mang) OR (cay mang)) may hoi. lieu ((va thuat) or (va chat)) soc va danh vi cua triet*.