Perhaps you should try some spelling variations:
phuong dong » phuong dung, phuong hoang, chuong duong
phuong cong » phong cong, phung cong, phuong hoang
chieu sach » chinh sach, chiet tach, chieu sang
hoc chieu » hoc thieu, ho chieu, hoc hien
tranh van » tran van, trinh van, thanh van
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu sach - canh tranh van ((phuong cong) or (phuong dong)) ((tac toan) OR (tam toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu sach - canh tranh van ((phuong cong) OR (phuong dong)) ((tac toan) OR (tam toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu sach - canh tranh van ((phuong cong) or (phuong dong)) ((tac toan) OR (tam toan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc chieu sach - canh tranh van ((phuong cong) or (phuong dong)) ((tac toan) OR (tam toan)) ban*.