Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
chieu sang » chieu sach, chieu xanh, hieu lang
tran hong » tran hoang, tran trong, tranh hang
va phuong » cac phuong
cong lang » cong vang, cong luong, cong quang
lang tuan » lang xuan, quang tuan, hoang tuan
tuan cu » tuan tu, quan cua, tuan thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (thieu khang)) - tran hong ((va phuong) OR (va thuong)) cong lang tuan cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (thieu khang)) - tran hong ((va phuong) OR (va thuong)) cong lang tuan cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (thieu khang)) - tran hong ((va phuong) OR (va thuong)) cong lang tuan cu".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (thieu khang)) - tran hong ((va phuong) OR (va thuong)) cong lang tuan cu*.