Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
thanh chau » thanh cha, thanh cham, thanh chu
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan cac, phan tu
khan cap » khan ap, than cap, khoan cam
va dung » van dung, va duong, vat dung

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