Perhaps you should try some spelling variations:
thanh quang » nhanh quang, thanh quan, than quang
duong cong » dung cong, luong cong, duong trong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
quang cua » quan cua, quang tuan, quang huy
cua duong » cua dong, cua huong, qua duong
hach toan » thanh toan, manh toan
tac toan » tap toan, tam toan, tich toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu manh) or (hieu lang)) - thanh quang cua duong cong ((tac toan) OR (hach toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu manh) OR (hieu lang)) - thanh quang cua duong cong ((tac toan) OR (hach toan)) tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu manh) or (hieu lang)) - thanh quang cua duong cong ((tac toan) OR (hach toan)) tap*".