Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
hieu ve » hieu van
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
bo van » vo van, so van, do van
x hoi » xa hoi, o hoi, x ho

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: ((te sach) OR (toc sach)) y nang x hoi. ((hieu ve) OR (hieu va)) bac bo van hanh dai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) y nang x hoi. ((hieu ve) OR (hieu va)) bac bo van hanh dai cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) y nang x hoi. ((hieu ve) OR (hieu va)) bac bo van hanh dai cua triet*.