Perhaps you should try some spelling variations:
nam thang » nam thanh, nam trong, nam trung
cua triet » cua viet, su triet, va triet
thang va » hang va, trang va, thong va
su sach » vu sach
so sach » so sanh, bo sach, co sach
dong xa » dong xay, duong xa, dong ha
hieu va » hieu qua
va hanh » van hanh, va thanh, va danh
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: ((su sach) OR (so sach)) van dong xa hoi. ((hieu va) OR (lieu va)) nam thang va hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) van dong xa hoi. ((hieu va) or (lieu va)) nam thang va hanh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) van dong xa hoi. ((hieu va) or (lieu va)) nam thang va hanh vi cua triet*.