Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
thanh vung » thanh vuong, thanh tung, thanh hung
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
vung dat » vung va
dan dung » van dung, tin dung, ap dung
dung dat » dung va, dung tai

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 vung dat ((dung cong) or (dang cong)) dan dung dat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh vung dat ((dung cong) OR (dang cong)) dan dung dat.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh vung dat ((dung cong) or (dang cong)) dan dung dat*.