Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
phuong doan » phuong loan, phuong hoang, huong dan
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
doanh cua » doanh luan
doan than » dan than, doan tuan, doan phan
manh cua » ban cua
than tap » toan tap, han tap, phan 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 tinh) or (chieu sach)) - hanh ((manh cua) OR (doanh cua)) dung phuong doan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu tinh) OR (chieu sach)) - hanh ((manh cua) OR (doanh cua)) dung phuong doan than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu tinh) or (chieu sach)) - hanh ((manh cua) OR (doanh cua)) dung phuong doan than tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu tinh) or (chieu sach)) - hanh ((manh cua) OR (doanh cua)) dung phuong doan than tap*.