Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hieu » cao hieu
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
vat hanh » vat thanh, van hanh, va hanh
van hoe » van hoa, van hoc, van hien
su sac » su sach, su cac
su xac » pu xac, su cac
vi cua » vai cua, di cua

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) OR (su xac)) ky nang ((van hoe) OR (van hieu)). hieu van nam thuc vat hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su xac)) ky nang ((van hoe) OR (van hieu)). hieu van nam thuc vat hanh vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su xac)) ky nang ((van hoe) OR (van hieu)). hieu van nam thuc vat hanh vi cua triet*.