Perhaps you should try some spelling variations:
phuong thong » phuong trong, thong thong, phuong hoang
chieu sach » chinh sach, chieu sang, chieu xanh
hanh tranh » canh tranh, hanh trinh, hanh trang
cua phuong » cuu phuong, cuc phuong, luan phuong
tranh cua » doanh cua, manh cua
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh tranh cua phuong thong ((tap toan) OR (tap quan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chiet tach)) - hanh tranh cua phuong thong ((tap toan) OR (tap quan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - hanh tranh cua phuong thong ((tap toan) OR (tap quan)) cau*.