Perhaps you should try some spelling variations:
phuong cong » phong cong, phung cong, phuong hoang
phuong dong » phuong dung, phuong hoang, chuong duong
chiet tach » chieu sach
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc chiet » hoc thiet, hoc nhiet, hoc hien
tranh va » tranh van, trang va, trinh va
than ban » thanh ban, than man, nhuan ban
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: hoc chiet tach - hanh tranh va ((phuong cong) OR (phuong dong)) dan ((than ban) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh tranh va ((phuong cong) OR (phuong dong)) dan ((than ban) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chiet tach - hanh tranh va ((phuong cong) OR (phuong dong)) dan ((than ban) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh tranh va ((phuong cong) OR (phuong dong)) dan ((than ban) or (toan ban))*.