Perhaps you should try some spelling variations:
tran phuong » tran phong, trinh phuong, doan phuong
phuong cong » phuong dong, phong cong, phung cong
anh xquang » anh quan, anh xuan
anh quang » anh quan, nhanh quang, tinh quang
doi chieu » doc hieu, mot chieu, ho chieu
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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 (doi chi)) sach - ((anh quang) OR (anh xquang)) tran phuong cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sach - ((anh quang) OR (anh xquang)) tran phuong cong tap toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (doi chi)) sach - ((anh quang) OR (anh xquang)) tran phuong cong tap toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doi chi)) sach - ((anh quang) OR (anh xquang)) tran phuong cong tap toan cau*.