Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
dap nhung » vap nhung, va nhung, dap ung
tung dap » tung dan, trung dai, tuong dan
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu quang) or (chieu sang)) - thanh tung dap nhung cong ((dan toan) or (anh tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (chieu sang)) - thanh tung dap nhung cong ((dan toan) OR (anh tuan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) or (chieu sang)) - thanh tung dap nhung cong ((dan toan) or (anh tuan)) cau*.