Perhaps you should try some spelling variations:
phuong trinh » chuong trinh, cong trinh, huong tran
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
trinh toan » tinh toan, thanh toan, trinh han
hanh hang » thanh hang, hang hang, hanh han
cua bang » chua bang, cua ban, cua dang
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - hanh hang ((cua bang) or (cua cong)) phuong trinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - hanh hang ((cua bang) OR (cua cong)) phuong trinh toan cau*.