Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
tranh va » tranh van, trang va, trinh va
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban
tinh » trinh, dinh, minh

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

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