Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cham tu » pham tu, cam tu, chai tu
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
vi cua » di cua
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 cham tu va hanh ((vi cua) OR (vai 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 cham tu va hanh ((vi cua) OR (vai cua)) triet~".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ((5 hoi) or (o hoi)). hieu ve cham tu va hanh ((vi cua) OR (vai cua)) triet*.