Perhaps you should try some spelling variations:
thanh luong » thanh huong, thanh long, thanh cuong
thieu sang » chieu sang, thieu khang, thieu quang
thanh hung » thanh huong, thanh tung, thanh trung
quan trong » gian trong
hoc thieu » toc thieu, hoc hien
thanh tap » thanh lap, thanh tai, thanh tay
cong tan » cong tac, cong san, cong thanh
song van » hoang van, trong van, duong van

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 luong) or (thanh hung)) quan trong ((cong tan) or (song van)) thanh tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((thanh luong) OR (thanh hung)) quan trong ((cong tan) OR (song van)) thanh tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((thanh luong) or (thanh hung)) quan trong ((cong tan) or (song van)) thanh tap*.