Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
phuong cong » phuong dong, phong cong, phung cong
tieu sach » chieu sach, dien sach, te sach
anh dung » anh dong, anh huong, sach dung
cong tac » cong ty
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - anh dung phuong cong ((cong san) OR (cong tac)) ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - anh dung phuong cong ((cong san) OR (cong tac)) ((toan cao) OR (toan ban))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - anh dung phuong cong ((cong san) OR (cong tac)) ((toan cao) or (toan ban))*".