Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
nhung cong » dung cong, thong cong, hang cong
trinh toan » tinh toan, thanh toan, trinh han
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
hinh toan » tinh toan, thanh toan, manh toan

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - thanh trung cua nhung cong ((hinh toan) OR (trinh toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - thanh trung cua nhung cong ((hinh toan) OR (trinh toan)) cao*.