Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
truong cua » truong ca, truong quan, truong cao
tien manh » tien anh, tien thanh, tran manh
dung cong » dung trong
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien manh) OR (tieng anh)) - manh ((trung tuan) OR (truong cua)) dung cong hach toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien manh) OR (tieng anh)) - manh ((trung tuan) or (truong cua)) dung cong hach toan ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((tien manh) OR (tieng anh)) - manh ((trung tuan) or (truong cua)) dung cong hach toan ban*.