Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
cong quang » luong quang, thong quang, duong quang
hieu lang » chieu sang, hieu quang, nhieu tang
hanh nang » ganh nang, anh nang, hanh mang
quang van » quang ban, quan van, quang uan
hoc hieu » hoc thieu, hoc hien, doc hieu
suat » xuat, luat, sua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh nang suat thong cong quang van ban~.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh nang suat thong cong quang van ban*.