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
thuat cao » thuat co, thuat bao, thuat cam
va duong » van duong, va tuong, va huong
cong ban » cong bang, cong tan, cong dan
cong san » cong tac
tung va » trung va, tuong va, dung va

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 tung va duong ((((cong ban) or (huong dan))) or (cong san)) thuat cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh tung va duong ((((cong ban) OR (huong dan))) OR (cong san)) thuat cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh tung va duong ((((cong ban) or (huong dan))) or (cong san)) thuat cao*.