Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh doi » danh di, thanh doi, dung doi
tang ky » dang ky, trong ky, tang khu
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
va danh » va dinh, va dan, va hanh
doi cua » dai cua, hoi cua
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
x hoi » xa hoi, o hoi, 5 hoi

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: te ((van ky) OR (tang ky)) nang ((x hoi) OR (x ho)). hieu ve cac luc va danh doi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((van ky) or (tang ky)) nang ((x hoi) OR (x ho)). hieu ve cac luc va danh doi cua triet~".
• Adding a wildcard symbol may retrieve word variants: te ((van ky) or (tang ky)) nang ((x hoi) OR (x ho)). hieu ve cac luc va danh doi cua triet*.