Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cuu tre » cua tre, cau tren, cau treo
te cac » tu cac, te cao, de cac
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
x hoi » xa hoi, x ho, 5 hoi
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 cac ky nang ((x hoi) or (o hoi)). hieu ve cac luc va hanh di ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky nang ((x hoi) OR (o hoi)). hieu ve cac luc va hanh di ((cuu tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: te cac ky nang ((x hoi) or (o hoi)). hieu ve cac luc va hanh di ((cuu tre) or (cua triet))*.