Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
vanh dai » van dai, vanh tai, lanh dao
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
va vanh » va van, va danh, va hanh
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
cua te » cua tu
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang ((xa hoi) or (o hoi)). hieu van cac luc va vanh dai ((cua te) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang ((xa hoi) OR (o hoi)). hieu van cac luc va vanh dai ((cua te) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: te sac ky nang ((xa hoi) or (o hoi)). hieu van cac luc va vanh dai ((cua te) or (cua triet))*.