Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
nang quan » ban quan, nang suat
hang cong » dang cong, hang nong, bang cong
mang qua » mang cua, mang vua, tang quan
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - hanh ((mang qua) or (nang quan)) hang cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((mang qua) OR (nang quan)) hang cong dan than cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((mang qua) or (nang quan)) hang cong dan than cao*.