Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu sang » chieu sang, thieu quang, hieu lang
tong cong » trong cong, dung cong, dang cong
cong cong » cong dong, trong cong, dung cong
canh ban » can ban, canh dan, canh van
san toan » van toan, dan toan, manh toan
toan tap » toan ban
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) OR (thieu khang)) - canh ban cua ((tong cong) or (cong cong)) san toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - canh ban cua ((tong cong) OR (cong cong)) san toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu khang)) - canh ban cua ((tong cong) or (cong cong)) san toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu khang)) - canh ban cua ((tong cong) or (cong cong)) san toan tap*.