Perhaps you should try some spelling variations:
thieu tach » thien hach, chieu sach, hieu cach
chiet tach » chieu sach
nhung cong » thong cong, hang cong, nhung don
tranh cua » doanh cua, manh cua
dung cong » dung trong
lang toan » dang toan, lang thang, lang thanh
toan tap » toan ban

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: toc ((thieu tach) OR (chiet tach)) - canh tranh cua ((nhung cong) OR (dung cong)) lang toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu tach) or (chiet tach)) - canh tranh cua ((nhung cong) OR (dung cong)) lang toan tap~".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu tach) or (chiet tach)) - canh tranh cua ((nhung cong) OR (dung cong)) lang toan tap*.