Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
duong cong » dung cong, luong cong, duong trong
hieu lang » hieu quang, nhieu tang, hieu van
cua duong » cua dong, cua huong, qua duong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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

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