Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong san » cong tac
than cau » toan cau, phan cau, than cap
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 cua dung cong san ((than cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh trung cua dung cong san ((than cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh trung cua dung cong san ((than cau) or (toan cao))*.