Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
cua tre » cua te, cuu tre, dua tren
cac tu » cac thu, cach tu, cac du
ca dan » cac dan, ca dao
dan va » doan va, dan ca, ban va
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai
tu ca » tu cua, tu can, tu cay

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang ((x hoi) or (o hoi)). hieu vien cac tu ca dan va ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((x hoi) OR (o hoi)). hieu vien cac tu ca dan va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ((x hoi) or (o hoi)). hieu vien cac tu ca dan va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((x hoi) or (o hoi)). hieu vien cac tu ca dan va ((cua tre) OR (cua triet))*.