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
hoang ban » hoang van, hang ban, hoang bao
hoan ban » toan ban, hon ban, hoang van
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 ((hoan ban) OR (hoang 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 ((hoan ban) OR (hoang ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trinh luat) or (trinh quan)) dang trong cong ((hoan ban) OR (hoang ban))*.