Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
canh manh » lanh manh, canh tranh, cach mang
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong dan » cong san, cong tan, huong dan
toan tai » toan tap, doanh tai, toan ban
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 manh ((cua dung) OR (cua dong)) cong dan ((toan tai) OR (toan cao))~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh manh ((cua dung) or (cua dong)) cong dan ((toan tai) or (toan cao))*.