Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
thang va » hang va, trang va, thong va
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than
tang va » trang va, tang van, tang vat

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 - anh ((tang va) or (thang va)) dung cong ((dan toan) or (dan than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - anh ((tang va) OR (thang va)) dung cong ((dan toan) OR (dan than)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - anh ((tang va) or (thang va)) dung cong ((dan toan) or (dan than)) ban*.