Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
xa hanh » xa thanh, xa khanh, va hanh
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hoa
o hai » co hai, so hai, o lai

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 sac ky nang ((5 hoi) OR (((o hoi) OR (o hai)))). hieu va cac tuc xa hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((5 hoi) or (((o hoi) OR (o hai)))). hieu va cac tuc xa hanh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ((5 hoi) or (((o hoi) OR (o hai)))). hieu va cac tuc xa hanh vi cua triet*.