Perhaps you should try some spelling variations:
phuong luong » thuong luong, phuong duong, phuong dung
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
cua phuong » cuu phuong, cuc phuong, luan phuong
cong cua » cong cu, dong cua, huong cua
mai toan » mai tan, mai loan, manh toan
bai toan » bai 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 - thanh cong cua phuong luong ((mai toan) or (bai toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - thanh cong cua phuong luong ((mai toan) OR (bai toan)) tap.
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh cong cua phuong luong ((mai toan) or (bai toan)) tap*.