Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
chiet tach » chieu sach
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
cua nhung » va nhung
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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: hoc ((thieu hach) OR (chiet tach)) - canh tranh cua nhung cong ((dan than) OR (ban than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu hach) or (chiet tach)) - canh tranh cua nhung cong ((dan than) OR (ban than)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu hach) or (chiet tach)) - canh tranh cua nhung cong ((dan than) OR (ban than)) cau*.