Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tuong quan » truong quan, thong quan, luong quan
dung cong » dung trong
hach toan » thanh toan, manh toan
ho chieu » theo chieu, hoc thieu, doi chieu
tung qua » dung qua, trung quan, duong qua
tac toan » tap toan, tam toan, tich toan

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: ho chieu sach - thanh ((tung qua) OR (tuong quan)) dung cong ((tac toan) OR (hach toan)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - thanh ((tung qua) OR (tuong quan)) dung cong ((tac toan) or (hach toan)) ban~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh ((tung qua) OR (tuong quan)) dung cong ((tac toan) or (hach toan)) ban*.