Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
va phuong » va thuong, cac phuong
sang toan » sang than, quang toan, sang tao
dang toan » dang tran, dan toan, dung toan
trung va » truong va, trang va, trung ha

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: "theo chieu sach - thanh trung va phuong cong ((sang toan) OR (dang toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh trung va phuong cong ((sang toan) OR (dang toan)) cau*.