Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
khanh toan » thanh toan, khanh thanh, khanh thuan
toan hoat » toan khoa, toan hoc, toan ho
dang cong » dung cong
hang cong » hang nong, bang cong, thanh cong
sat nhan » hat nhan, sat phan, ca nhan
nhan tu » nhanh tu, phan tu, nhan su

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc thieu sang - khanh toan hoat ((dang cong) or (hang cong)) sat nhan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - khanh toan hoat ((dang cong) OR (hang cong)) sat nhan tu*.