Perhaps you should try some spelling variations:
cong khanh » cong thanh, cong khan, cong nhan
khanh pham » thanh pham, thanh phan, hang pham
hanh dung » thanh dung, anh dung, hanh dong
luan dang » luan nang, luan danh, luan dong
dang cong » dung cong
doc hieu » hoc thieu, hoc hien
pham lap » phan lap, pham lan, pham gap

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 (toc thieu)) sang - hanh dung luan dang cong khanh pham lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) sang - hanh dung luan dang cong khanh pham lap.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) sang - hanh dung luan dang cong khanh pham lap*.