Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
trong quan » thong quan, tong quan, thong quang
thong cong » trong cong, tong cong, thong thong
cong quang » luong quang, thong quang, duong quang
quang chat » quang chan, quang phat, quang cao
hoc thieu » toc thieu, hoc hien
chat cao » chat co, chat cho, chat bao

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 quan) or (truong dai)) thong cong quang chat cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((trong quan) OR (truong dai)) thong cong quang chat cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trong quan) or (truong dai)) thong cong quang chat cao*.