Perhaps you should try some spelling variations:
trinh nhan » trinh han, trinh phan, trinh nha
hieu lang » chieu sang, hieu quang, nhieu tang
nhan thuc » nhan luc, dan thuc, toan thuc
thuc hung » thuc chung, thuc nhung, thuc dung
cong tang » cong thang, cong lang, cong bang
cong vang » cong lang, cong quang, cong ngang
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tan » cong tac, cong san, cong thanh

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: hoc hieu lang - trinh nhan thuc hung ((cong tan) OR (((cong tang) OR (cong vang)))) phan tu~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - trinh nhan thuc hung ((cong tan) or (((cong tang) or (cong vang)))) phan tu*.