Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thanh trung » thanh tung
thieu sang » chieu sang, thieu quang, hieu lang
trung cap » truong cao, trung tam
hang nong » thang long, han tong
cap hang » cap hoang, cap bang, cap han
nong dan » cong dan, nong san, nguong dan
toan cao » toan ban
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - thanh trung cap hang nong dan ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu khang)) - thanh trung cap hang nong dan ((toan cao) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu khang)) - thanh trung cap hang nong dan ((toan cao) or (toan tap))*.