Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
phan cau » phan dau, phan cac, phan tu
toan cao » toan ban, toan tap

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 - ((thanh trung) or (thanh tung)) cua dung cong san ((phan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((thanh trung) OR (thanh tung)) cua dung cong san ((phan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((thanh trung) or (thanh tung)) cua dung cong san ((phan cau) or (toan cao))*.