Perhaps you should try some spelling variations:
khanh thanh » nhanh thanh, thanh thanh, phan thanh
khanh toan » thanh toan, khanh thuan, manh toan
luan hang » luan nang, luan han, luan hung
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu
anh dung » anh dong, anh huong, sach dung

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