Perhaps you should try some spelling variations:
tran phuong » tran phong, trinh phuong, doan phuong
phuong cong » phuong dong, phong cong, phung cong
quang tran » quang tuan, quang trung, quang thanh
doi chieu » doi chi, mot chieu, ho chieu
anh quang » anh xquang, anh quan, nhanh quang
doc hieu » toc thieu, hoc thieu, hoc hien
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » 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) OR (doc hieu)) sach - anh quang tran phuong cong tap toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) sach - anh quang tran phuong cong tap toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doc hieu)) sach - anh quang tran phuong cong tap toan cau*.