Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
ngan luc » nhan luc, nguon luc, nganh suc
van hoi » van hoa, van hoc, van hoe
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
cai ky » cac ky, cam ky, sai ky
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((cai ky) or (cao ky)) lang van hoi. hieu vu ngan luc ((va dan) or (dia ban)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cai ky) OR (cao ky)) lang van hoi. hieu vu ngan luc ((va dan) OR (dia ban)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((cai ky) or (cao ky)) lang van hoi. hieu vu ngan luc ((va dan) or (dia ban)) dai cua tre*.