Perhaps you should try some spelling variations:
cong thuong » hang thuong
chieu xanh » chieu sach, chieu sang, chieu tinh
nhanh mang » nhanh lang, hanh mang, nhanh quang
doi chieu » doc hieu, doi chi, ho chieu
cong lang » cong vang, cong luong, cong quang
toan tap » toan ban
mang va » mang vua, hang va, bang va
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu xanh - nhanh mang va dung ((cong lang) or (cong thuong)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - nhanh mang va dung ((cong lang) OR (cong thuong)) toan tap*.