Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thien hach » thien thanh, hien hanh
nhung cong » thong cong, hang cong, nhung don
tranh cua » doanh cua, manh cua
dung cong » dung trong
tac toan » tap toan, tam toan, hach toan
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: hoc ((chieu sach) OR (thien hach)) - canh tranh cua ((nhung cong) OR (dung cong)) tac toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (thien hach)) - canh tranh cua ((nhung cong) OR (dung cong)) tac toan tap~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (thien hach)) - canh tranh cua ((nhung cong) OR (dung cong)) tac toan tap*.