Perhaps you should try some spelling variations:
luan bang » luan nang, luan ban, luan tang
bang cong » dang cong, bang song, hang cong
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
doc hieu » toc thieu, hoc thieu
anh dung » anh huong, sach dung, ung dung
anh dong » anh huong, anh son
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (hoc hien)) sang - ((anh dung) OR (anh dong)) luan bang cong hach toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) sang - ((anh dung) OR (anh dong)) luan bang cong hach toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (hoc hien)) sang - ((anh dung) OR (anh dong)) luan bang cong hach toan ban".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc hien)) sang - ((anh dung) OR (anh dong)) luan bang cong hach toan ban*.