Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
su sach » vu sach
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
so sach » so sanh, bo sach, co sach
hieu ve » hieu van
ma hoi » mai hoi, xa hoi, ma hoa
toc va » hoc va, toc ta, tuc va

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