Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
cong cong » trong cong, dung cong, dang cong
hach toan » thanh toan, manh toan
ho chiet » ho chieu, ho thiet, hoc thiet
tac toan » tap toan, tam toan, tich toan

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: ho chiet tach - hanh trinh cua ((cong cong) OR (cong dong)) ((tac toan) OR (hach toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - hanh trinh cua ((cong cong) or (cong dong)) ((tac toan) OR (hach toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh trinh cua ((cong cong) or (cong dong)) ((tac toan) OR (hach toan)) cao*.