Perhaps you should try some spelling variations:
thieu khang » thieu quang
chieu khong » chien chong, chu khong, chieu duong
thanh trung » thanh tung
trung cua » truong cua, trung tuan, trung cap
cua huong » cua phuong, cua thuong, cua truong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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