Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
trinh quan » tinh quang, trinh han
dang trong » dung trong, dong trong, lang trong
hoc thieu » toc thieu, hoc hien
cong toan » cong hoan, cong tuan, cong doan
cong tan » cong tac, cong san, cong thanh
luat » luan, xuat

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 - hanh ((trinh luat) OR (trinh quan)) dang trong ((cong toan) OR (cong tan)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - hanh ((trinh luat) or (trinh quan)) dang trong ((cong toan) OR (cong tan)) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trinh luat) or (trinh quan)) dang trong ((cong toan) OR (cong tan)) ban*.