Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thanh trung » thanh tung
nhung duong » nhung dung, nhung huong, nhung tuong
thieu sang » chieu sang, thieu quang, hieu lang
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
duong anh » duong manh, duong xanh, duong vanh
toan thuc » toan hoc, dan thuc, nhan thuc
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)) - thanh trung cua nhung duong anh ((tuan cu) or (toan thuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - thanh trung cua nhung duong anh ((tuan cu) OR (toan thuc)).
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (thieu khang)) - thanh trung cua nhung duong anh ((tuan cu) or (toan thuc))*.