Perhaps you should try some spelling variations:
mang luan » tang luan, bang luan, mong luan
hang luan » tang luan, dung luan
hung cong » nhung cong, hung cuong, phung cong
hoc dieu » hoc thieu, hoc hien
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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: hoc dieu hanh - hanh ((mang luan) or (hang luan)) hung cong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc dieu hanh - hanh ((mang luan) OR (hang luan)) hung cong tac toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc dieu hanh - hanh ((mang luan) or (hang luan)) hung cong tac toan ban*.