Perhaps you should try some spelling variations:
thanh phung » thanh phuong, thanh hung, thanh chuong
khanh phung » khanh phong, thanh phuong, khanh thuong
anh xquang » anh quang, anh quan, anh xuan
doi chieu » doc hieu, mot chieu, ho chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach 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 xquang ((thanh phung) or (khanh phung)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doi chi)) sach - anh xquang ((thanh phung) OR (khanh phung)) cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doi chi)) sach - anh xquang ((thanh phung) or (khanh phung)) cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (doi chi)) sach - anh xquang ((thanh phung) or (khanh phung)) cong tac toan cau*.