Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thanh tuong » thanh thuong, thanh tung, thanh huong
thieu sang » chieu sang, thieu khang, hieu lang
cua phuong » cuu phuong, cuc phuong, luan phuong
tuong cua » truong cua, huong cua, thong cua
dung danh » dung doanh, dung dan, cuong danh
dung anh » duong anh, dong anh, hung anh
toan tu » toan du, tran tu, doan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((thieu sang) or (thieu quang)) - thanh tuong cua phuong ((dung anh) OR (dung danh)) toan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sang) OR (thieu quang)) - thanh tuong cua phuong ((dung anh) OR (dung danh)) toan tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sang) or (thieu quang)) - thanh tuong cua phuong ((dung anh) OR (dung danh)) toan tu".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sang) or (thieu quang)) - thanh tuong cua phuong ((dung anh) OR (dung danh)) toan tu*.