Perhaps you should try some spelling variations:
phuong trinh » chuong trinh, cong trinh, huong tran
thi phuong » thi truong
trinh toan » tinh toan, thanh toan, trinh han
hieu quan » hieu qua, lieu quan, thien quan
tranh cua » manh cua
doanh cua » doanh luan
doi hieu » doi chieu, doc hieu, doi hien
toan cao » toan ban, toan tap

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: "doi hieu quan - canh ((tranh cua) OR (doanh cua)) thi phuong trinh toan cao~".
• Adding a wildcard symbol may retrieve word variants: doi hieu quan - canh ((tranh cua) OR (doanh cua)) thi phuong trinh toan cao*.