Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien tach » thien hach, chiet tach, vien bach
tranh cua » doanh cua, manh cua
cua nhung » va nhung
dan toan » manh toan, xuan toan, dien toan
dan than » dan chan, ban than, van than
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: hoc hien tach - canh tranh cua nhung cong ((((dan toan) OR (dan than))) or (van toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tach - canh tranh cua nhung cong ((((dan toan) OR (dan than))) OR (van toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien tach - canh tranh cua nhung cong ((((dan toan) OR (dan than))) or (van toan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc hien tach - canh tranh cua nhung cong ((((dan toan) OR (dan than))) or (van toan)) ban*.