Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
hai hieu » hai chieu, hoi hieu, phan hieu
tan toan » tan tran, tap toan, dan toan
van toan » van tuan, van tan, van thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hai hieu lang - canh tranh cua nhung cong ((tan toan) OR (van toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hai hieu lang - canh tranh cua nhung cong ((tan toan) OR (van toan)) cau".
• Adding a wildcard symbol may retrieve word variants: hai hieu lang - canh tranh cua nhung cong ((tan toan) OR (van toan)) cau*.