Perhaps you should try some spelling variations:
trinh thanh » tinh thanh, trinh han, dinh thanh
chiet tach » chieu sach
trung tuan » trung thanh, tran tuan, truong thanh
nhung cong » dung cong, thong cong, hang cong
trinh toan » tinh toan, thanh toan, trinh han
ho chiet » ho chieu, ho thiet, hoc thiet

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 tuan) or (trung tam)) nhung cong ((trinh thanh) OR (trinh toan)) cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - thanh ((trung tuan) OR (trung tam)) nhung cong ((trinh thanh) OR (trinh toan)) cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - thanh ((trung tuan) or (trung tam)) nhung cong ((trinh thanh) OR (trinh toan)) cap".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - thanh ((trung tuan) or (trung tam)) nhung cong ((trinh thanh) OR (trinh toan)) cap*.