Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
trong dan » trong dang, trong tan, trong ban
trong san » trong cac, cong san, dong san
canh ban » can ban, canh dan, canh van
cua dang » cua cong, cua ban
khan cap » khan ap, than cap, khoan cam
phan cam » phan cac, phan cau, khoan cam
ban cua » ban quan

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 cua dang ((trong dan) or (trong san)) ((khan cap) or (phan cam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - canh ban cua dang ((trong dan) OR (trong san)) ((khan cap) OR (phan cam)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh ban cua dang ((trong dan) or (trong san)) ((khan cap) or (phan cam))*.