Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cac toc » cac toi, cac thoi
su sach » vu sach
vang xa » lang xa, mang xa, ang xa
ly vang » ly hang, ly van, ly quang
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua

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