Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
quan trong » gian trong
hoc thieu » toc thieu, hoc hien
toan quan » tran quang, doan quang, van quan
thanh chu » thanh chau, thanh cha, thanh thu
thanh lap » thanh san, phan lap, thanh hai
cong tan » cong tac, cong san, cong thanh

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 - tinh toan quan trong cong tan ((thanh chu) or (thanh lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - tinh toan quan trong cong tan ((thanh chu) OR (thanh lap))*.