Perhaps you should try some spelling variations:
nhanh dang » nhan dang, nhanh dong, nhanh lang
dang dang » dang dung, dung dang, dang bang
dang cong » dung cong
cong doan » cong dan, cong hoan, dong doanh
doc hieu » hoc thieu, hoc hien
doan van » doan va, hoang van, luan van
van dan » van ban, ban dan, van dao

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)) tinh - nhanh dang dang cong doan van dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) tinh - nhanh dang dang cong doan van dan ca.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) tinh - nhanh dang dang cong doan van dan ca*.