Perhaps you should try some spelling variations:
doi chieu » doi chi, mot chieu, ho chieu
anh quang » anh xquang, anh quan, nhanh quang
tran hung » tran hong, tran hoang, tran huu
doc hieu » toc thieu, hoc thieu, hoc hien
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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 hung) or (tran quang)) cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - anh quang ((tran hung) OR (tran quang)) cong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) sach - anh quang ((tran hung) or (tran quang)) cong tac toan cao*.