Perhaps you should try some spelling variations:
phuong thuong » thong thuong, phuong duong, phuong luong
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 » bai toan, mai tan, manh toan
mai loan » mai lan, mai hoang, mai quan

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 thuong ((mai toan) OR (mai loan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - thanh cong cua phuong thuong ((mai toan) OR (mai loan)) tap".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - thanh cong cua phuong thuong ((mai toan) OR (mai loan)) tap*.