Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
phuong cong » phuong dong, phong cong, phung cong
thieu sang » chieu sang, thieu quang, hieu lang
tran thong » toan thong, tran hong, tran trong
va phuong » va thuong, cac phuong
cong lang » cong vang, cong luong, cong quang
lang tuan » lang xuan, quang tuan, hoang tuan
thong va » thong cua, truong va, thong qua
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 ((thieu sang) or (thieu khang)) - tran thong va phuong cong lang tuan cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - tran thong va phuong cong lang tuan cu.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu khang)) - tran thong va phuong cong lang tuan cu*.