Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
tranh chua » tranh cua, trinh chuan, tranh chap
hoc thieu » toc thieu, hoc hien
chua bang » chu bang, chua nang, chua xang
luong tai » dung tai, luong va
cong tac » cong ty
toan cao » toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - canh tranh chua bang ((luong tai) OR (cong tac)) toan cao~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh tranh chua bang ((luong tai) or (cong tac)) toan cao*.