Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
trung cua » truong cua, trung tuan, trung cap
nong cong » cong cong, nang cong, dong cong
tong cong » trong cong, cong cong, dung 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 - thanh trung cua ((nong cong) OR (tong cong)) tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - thanh trung cua ((nong cong) OR (tong cong)) tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - thanh trung cua ((nong cong) OR (tong cong)) tac toan cau*.