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
canh ban » can ban, canh dan, doanh ban
canh van » anh van, can van, cach van
cong dan » cong san, cong tan, huong dan
than tap » han tap, phan tap, than cap
toan tap » toan ban
va dung » van dung, va duong, vat dung

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