Perhaps you should try some spelling variations:
thanh dung » thanh duong, thanh tung, thanh hung
dung phan » dung nhan, dung luan, dung ha
phan phan » phap phan, phan phat, than phan
phan cong » thanh cong
doc hieu » hoc thieu, hoc hien
cong van » cong vang, cong san, song 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 - thanh dung phan phan cong van dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) tinh - thanh dung phan phan cong van dan ca.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) tinh - thanh dung phan phan cong van dan ca*.