Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhung cong » thong cong, hang cong, nhung don
lieu tinh » trieu tinh, diep tinh, bien tinh
tranh cua » doanh cua, manh cua
dung cong » dung trong
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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