Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
xanh tai » hanh tai, anh tai, vanh tai
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac loc » cac lop, cac toc, cac hoc
danh di » danh du, xanh di, danh dien
de cac » den cac, ve cac, de cai
loc va » hoc va, luc va
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: de cac ky nang x hoi. ((hieu ve) OR (hieu va)) cac loc va ((danh di) OR (xanh tai)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "de cac ky nang x hoi. ((hieu ve) OR (hieu va)) cac loc va ((danh di) or (xanh tai)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: de cac ky nang x hoi. ((hieu ve) OR (hieu va)) cac loc va ((danh di) or (xanh tai)) cua triet*.