Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
toan tai » toan tap, doanh tai, toan ban
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
nhan va » nhan tai, nhan dan, nhan tao
than ma » than man, than va, khan ma

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