Perhaps you should try some spelling variations:
tran phuong » tran phong, trinh phuong, doan phuong
phuong cong » phuong dong, phong cong, phung cong
chieu sach » chinh sach, chieu sang, chieu xanh
quang tran » quang tuan, quang trung, quang thanh
anh quang » anh xquang, anh quan, nhanh quang
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (chiet tach)) - anh quang tran phuong cong bai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - anh quang tran phuong cong bai toan cao.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (chiet tach)) - anh quang tran phuong cong bai toan cao*.