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
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
thanh hai » thanh phan, thanh hoa
trong am » trong lam, trong nam, trong dam
am dung » am duong, lam dung, ap 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 am dung cong quang ((thanh hai) or (thanh san))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh trong am dung cong quang ((thanh hai) OR (thanh san)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trong am dung cong quang ((thanh hai) or (thanh san))*.