Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh trong » hanh trang, anh trong, hinh trong
cong quang » luong quang, thong quang, duong quang
thanh phan » thanh pho, thanh toan, thanh hai
hoc thieu » toc thieu, hoc hien
trong nam » thong nam, trong lam, trong cac
dung cong » dung trong
nam dung » nam vung, nam dong, am dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - hanh trong nam dung cong quang ((thanh phan) or (thanh san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh trong nam dung cong quang ((thanh phan) OR (thanh san)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trong nam dung cong quang ((thanh phan) or (thanh san))*.