Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
trinh qua » trinh quan, trinh quang, trinh luat
trinh cua » tinh cua, trinh luat, trinh quan
hang nong » thang long, han tong
nong dan » cong dan, nong san, nguong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 qua) OR (trinh cua)) hang nong dan than cau~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((trinh qua) or (trinh cua)) hang nong dan than cau*.