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
hoc thieu » toc thieu, hoc hien
cong vang » cong lang, cong quang, cong ngang
vang chat » van chat, van phat, va chat
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 vang 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 vang chat cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trong quan) or (truong dai)) thong cong vang chat cao*.