Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
khong cang » thong cong, hong bang, khong dung
trung cua » truong cua, trung tuan, trung cap
ho chiet » ho chieu, ho thiet, hoc thiet
thong co » thong o, trong co, thong cong
toan tap » toan ban

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 ((thong co) or (khong cang)) tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - thanh trung cua ((thong co) OR (khong cang)) tinh toan tap.
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - thanh trung cua ((thong co) or (khong cang)) tinh toan tap*.