Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
thieu sang » chieu sang, thieu khang, thieu quang
doanh gian » doanh giao, doanh giai, dan gian
hoc thieu » toc thieu, hoc hien
lang nong » hang nong, lang song, lang vong
lang dong » lang trong, lao dong, cong dong
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - doanh doanh gian ((lang nong) OR (lang dong)) ((dan than) OR (van than)) man~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - doanh doanh gian ((lang nong) or (lang dong)) ((dan than) OR (van than)) man~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - doanh doanh gian ((lang nong) or (lang dong)) ((dan than) OR (van than)) man*.