Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
cong san » cong tac
san toan » van toan, dan toan, manh toan
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: doi ((chieu sang) or (hieu quang)) - thanh ((trung cua) OR (trung cap)) thuong cong san toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu quang)) - thanh ((trung cua) OR (trung cap)) thuong cong san toan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) or (hieu quang)) - thanh ((trung cua) OR (trung cap)) thuong cong san toan tap*".