Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
tranh viet » tran viet, trinh viet, trang viet
hoc thieu » toc thieu, hoc hien
viet hung » viet huong, viet trung
cong dung » cuong dung, cong dong, cong luong
thanh lap » thanh san, phan lap, thanh hai
cong dan » cong san, cong tan, huong dan

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 - canh tranh viet hung ((cong dan) or (cong dung)) thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - canh tranh viet hung ((cong dan) OR (cong dung)) thanh lap*.