Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
truong quan » trong quan, thong quan, luong quan
thieu sang » chieu sang, thieu quang, hieu lang
trung tuan » trung thanh, trung tam, tran tuan
thong cong » trong cong, tong cong, thong thong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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