Perhaps you should try some spelling variations:
thanh tung » thanh cong
cua thuong » cua truong, cua phuong, cua huong
hieu sang » chieu sang, hieu lang, hieu quang
cua khong » hua khong, cua phuong, cua cong
ca thuong » cao thuong, va thuong, cp thuong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sang - thanh tung ((cua khong) or (((cua thuong) OR (ca thuong)))) cong tac phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sang - thanh tung ((cua khong) OR (((cua thuong) OR (ca thuong)))) cong tac phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sang - thanh tung ((cua khong) or (((cua thuong) OR (ca thuong)))) cong tac phan cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu sang - thanh tung ((cua khong) or (((cua thuong) OR (ca thuong)))) cong tac phan cau*.