Perhaps you should try some spelling variations:
quang trong » quang truong, quang trung, quan trong
phung cong » nhung cong, phong cong, nhung chong
doi chieu » doi chi, mot chieu, ho chieu
anh quang » anh xquang, anh quan, nhanh quang
hung cong » nhung cong, hung cuong, dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
tac toan » tap toan, tam toan, hach 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 trong ((hung cong) or (phung cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - anh quang trong ((hung cong) OR (phung cong)) tac toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (doc hieu)) sach - anh quang trong ((hung cong) or (phung cong)) tac toan cau*".