Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
cong cong » cong dong, dung cong, dang cong
ho chiet » ho chieu, ho thiet, hoc thiet
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - ((hanh trinh) or (thanh trung)) cua ((cong cong) OR (trong cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - ((hanh trinh) OR (thanh trung)) cua ((cong cong) OR (trong cong)) tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - ((hanh trinh) or (thanh trung)) cua ((cong cong) OR (trong cong)) tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - ((hanh trinh) or (thanh trung)) cua ((cong cong) OR (trong cong)) tac toan cau*.