Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va hanh » van hanh, va thanh, va danh
cham tu » pham tu, cam tu, chai tu
hieu va » lieu va, hieu qua
hieu ve » hieu van
san ky » sang ky, van ky, dan ky
vi cua » vai cua, di cua
tu san » thu san, tu ban, tu can
o hoi » co hoi, o hoc, o hai

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