Perhaps you should try some spelling variations:
doanh phan » doanh nhan, doan phan, doanh thanh
phan quang » pham quang, phan quan, nhanh quang
quang dung » quang trung, ung dung, cuong dung
bang thanh » ban thanh, dang thanh, tang thanh
doi chieu » doc hieu, doi chi, ho chieu
dung cong » dung trong
cong bang » cuong bang, dong bang, hong bang
thanh cau » thanh chau, thanh mau, nhanh cau

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) or (mot chieu)) sach - doanh phan quang dung cong bang thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (mot chieu)) sach - doanh phan quang dung cong bang thanh cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (mot chieu)) sach - doanh phan quang dung cong bang thanh cau*.