Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu tinh » trieu tinh, lieu tinh, chau tinh
hieu lang » chieu sang, hieu quang, nhieu tang
tranh va » tranh van, trang va, trinh va
san toan » dan toan, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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

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