Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu sang » chieu sang, thieu quang, hieu lang
canh thanh » canh tranh, danh thanh, anh thanh
van nhuong » van chuong, van phuong, van huong
cong thanh » dong thanh, cong trinh, cong tan
thanh van » thanh san, thanh toan, thanh phan
cong danh » cuong danh, cong dan, cong khanh
toan tap » toan ban

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)) - canh thanh van nhuong ((cong danh) or (cong thanh)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu khang)) - canh thanh van nhuong ((cong danh) OR (cong thanh)) toan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu khang)) - canh thanh van nhuong ((cong danh) or (cong thanh)) toan tap*".