Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu sang » chieu sang, thieu quang, hieu lang
truong cua » truong ca, truong quan, truong cao
nhung cong » dung cong, thong cong, hang cong
trang cua » tranh cua, tang cua, trung cua
dan thanh » dang thanh, danh thanh, ban thanh
cong dan » cong san, cong tan, huong dan

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