Perhaps you should try some spelling variations:
tranh hang » trinh han, tran hoang, tran hong
tran hung » tran hong, tran quang, tran hoang
ho chieu » theo chieu, hoc thieu, mot chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban
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: ((ho chieu) or (doi chi)) sach - nhanh quang ((tran hung) or (tranh hang)) cong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chi)) sach - nhanh quang ((tran hung) OR (tranh hang)) cong tac toan ban.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chi)) sach - nhanh quang ((tran hung) or (tranh hang)) cong tac toan ban*.