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 dong, anh huong, sach dung
toan tap » toan 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 luan bang cong hach toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) sang - anh dung luan bang cong hach toan tap.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc hien)) sang - anh dung luan bang cong hach toan tap*.